From 37a52792914cd9778df623b368ed6522badf9f91 Mon Sep 17 00:00:00 2001
From: marcinzelent <marcin@zelent.net>
Date: Sun, 4 Jun 2017 18:46:24 +0200
Subject: Moved getting data method calls to handlers.

---
 .../ApartmentManager/ApartmentManager.csproj       | 99 +++++++++++-----------
 .../ApartmentManager/Handler/ApartmentHandler.cs   | 40 +++++----
 .../Handler/BmApartmentsHandler.cs                 |  1 +
 .../ApartmentManager/Handler/BmChangesHandler.cs   | 23 ++---
 .../ApartmentManager/Handler/BmDefectsHandler.cs   |  3 +-
 .../ApartmentManager/Handler/BmResidentsHandler.cs |  7 +-
 .../ApartmentManager/Handler/BmUsersHandler.cs     |  3 +-
 .../ApartmentManager/Handler/LoginHandler.cs       | 15 ----
 .../ApartmentManager/Singletons/BmSingleton.cs     | 11 +--
 .../Singletons/CatalogSingleton.cs                 |  9 +-
 .../ViewModel/ApartmentViewModel.cs                | 10 +--
 .../ViewModel/BmChangesViewModel.cs                |  4 +-
 12 files changed, 104 insertions(+), 121 deletions(-)

diff --git a/ApartmentManager/ApartmentManager/ApartmentManager.csproj b/ApartmentManager/ApartmentManager/ApartmentManager.csproj
index d9da403..dd57ae5 100644
--- a/ApartmentManager/ApartmentManager/ApartmentManager.csproj
+++ b/ApartmentManager/ApartmentManager/ApartmentManager.csproj
@@ -18,6 +18,7 @@
     <ProjectTypeGuids>{A5A43C5B-DE2A-4C0C-9213-0A381AF9435A};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}</ProjectTypeGuids>
     <WindowsXamlEnableOverview>true</WindowsXamlEnableOverview>
     <PackageCertificateKeyFile>ApartmentManager_TemporaryKey.pfx</PackageCertificateKeyFile>
+    <PackageCertificateThumbprint>B7E9DDD60132C6D61DA845D26A66BC87426041DD</PackageCertificateThumbprint>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'Debug|x86'">
     <DebugSymbols>true</DebugSymbols>
@@ -108,7 +109,7 @@
     <Compile Include="Handler\LoginHandler.cs" />
     <Compile Include="Handler\ApartmentHandler.cs" />
     <Compile Include="Model\Apartment.cs" />
-    <Compile Include="Model\ApartmentChange.cs" />
+    <Compile Include="Model\Change.cs" />
     <Compile Include="Model\ChangeComment.cs" />
     <Compile Include="Model\ChangeDocument.cs" />
     <Compile Include="Model\DefectComment.cs" />
@@ -131,67 +132,67 @@
     <Compile Include="ViewModel\BmDefectsViewModel.cs" />
     <Compile Include="ViewModel\ApartmentViewModel.cs" />
     <Compile Include="ViewModel\LoginViewModel.cs" />
-    <Compile Include="View\ApartmentChangesPage.xaml.cs">
+    <Compile Include="View\User pages\ApartmentChangesPage.xaml.cs">
       <DependentUpon>ApartmentChangesPage.xaml</DependentUpon>
     </Compile>
-    <Compile Include="View\ApartmentChangesViewPage.xaml.cs">
+    <Compile Include="View\User pages\ApartmentChangesViewPage.xaml.cs">
       <DependentUpon>ApartmentChangesViewPage.xaml</DependentUpon>
     </Compile>
-    <Compile Include="View\ApartmentDefectPage.xaml.cs">
+    <Compile Include="View\User pages\ApartmentDefectPage.xaml.cs">
       <DependentUpon>ApartmentDefectPage.xaml</DependentUpon>
     </Compile>
-    <Compile Include="View\ApartmentDefectViewPage.xaml.cs">
+    <Compile Include="View\User pages\ApartmentDefectViewPage.xaml.cs">
       <DependentUpon>ApartmentDefectViewPage.xaml</DependentUpon>
     </Compile>
-    <Compile Include="View\ApartmentNewChangePage.xaml.cs">
+    <Compile Include="View\User pages\ApartmentNewChangePage.xaml.cs">
       <DependentUpon>ApartmentNewChangePage.xaml</DependentUpon>
     </Compile>
-    <Compile Include="View\ApartmentNewDefect.xaml.cs">
+    <Compile Include="View\User pages\ApartmentNewDefect.xaml.cs">
       <DependentUpon>ApartmentNewDefect.xaml</DependentUpon>
     </Compile>
-    <Compile Include="View\ApartmentPage.xaml.cs">
+    <Compile Include="View\User pages\ApartmentPage.xaml.cs">
       <DependentUpon>ApartmentPage.xaml</DependentUpon>
     </Compile>
-    <Compile Include="View\BmChangesPage.xaml.cs">
+    <Compile Include="View\Board member pages\BmChangesPage.xaml.cs">
       <DependentUpon>BmChangesPage.xaml</DependentUpon>
     </Compile>
-    <Compile Include="View\BmCreateChangePage.xaml.cs">
+    <Compile Include="View\Board member pages\BmCreateChangePage.xaml.cs">
       <DependentUpon>BmCreateChangePage.xaml</DependentUpon>
     </Compile>
-    <Compile Include="View\BmCreateDefectPage.xaml.cs">
+    <Compile Include="View\Board member pages\BmCreateDefectPage.xaml.cs">
       <DependentUpon>BmCreateDefectPage.xaml</DependentUpon>
     </Compile>
-    <Compile Include="View\BmEditApartmentPage.xaml.cs">
+    <Compile Include="View\Board member pages\BmEditApartmentPage.xaml.cs">
       <DependentUpon>BmEditApartmentPage.xaml</DependentUpon>
     </Compile>
-    <Compile Include="View\BmEditChangePage.xaml.cs">
+    <Compile Include="View\Board member pages\BmEditChangePage.xaml.cs">
       <DependentUpon>BmEditChangePage.xaml</DependentUpon>
     </Compile>
-    <Compile Include="View\BmEditDefectPage.xaml.cs">
+    <Compile Include="View\Board member pages\BmEditDefectPage.xaml.cs">
       <DependentUpon>BmEditDefectPage.xaml</DependentUpon>
     </Compile>
-    <Compile Include="View\BmResidentsPage.xaml.cs">
+    <Compile Include="View\Board member pages\BmResidentsPage.xaml.cs">
       <DependentUpon>BmResidentsPage.xaml</DependentUpon>
     </Compile>
-    <Compile Include="View\BmApartmentsPage.xaml.cs">
+    <Compile Include="View\Board member pages\BmApartmentsPage.xaml.cs">
       <DependentUpon>BmApartmentsPage.xaml</DependentUpon>
     </Compile>
-    <Compile Include="View\BmDefectsPage.xaml.cs">
+    <Compile Include="View\Board member pages\BmDefectsPage.xaml.cs">
       <DependentUpon>BmDefectsPage.xaml</DependentUpon>
     </Compile>
-    <Compile Include="View\BmMainPage.xaml.cs">
+    <Compile Include="View\Board member pages\BmMainPage.xaml.cs">
       <DependentUpon>BmMainPage.xaml</DependentUpon>
     </Compile>
-    <Compile Include="View\BmCreateApartmentPage.xaml.cs">
+    <Compile Include="View\Board member pages\BmCreateApartmentPage.xaml.cs">
       <DependentUpon>BmCreateApartmentPage.xaml</DependentUpon>
     </Compile>
-    <Compile Include="View\BmSingleChangePage.xaml.cs">
+    <Compile Include="View\Board member pages\BmSingleChangePage.xaml.cs">
       <DependentUpon>BmSingleChangePage.xaml</DependentUpon>
     </Compile>
-    <Compile Include="View\BmSingleDefectPage.xaml.cs">
+    <Compile Include="View\Board member pages\BmSingleDefectPage.xaml.cs">
       <DependentUpon>BmSingleDefectPage.xaml</DependentUpon>
     </Compile>
-    <Compile Include="View\BmUsersPage.xaml.cs">
+    <Compile Include="View\Board member pages\BmUsersPage.xaml.cs">
       <DependentUpon>BmUsersPage.xaml</DependentUpon>
     </Compile>
     <Compile Include="View\LoginPage.xaml.cs">
@@ -200,10 +201,10 @@
     <Compile Include="View\PersonalInfoPage.xaml.cs">
       <DependentUpon>PersonalInfoPage.xaml</DependentUpon>
     </Compile>
-    <Compile Include="View\ApartmentPlanPage.xaml.cs">
+    <Compile Include="View\User pages\ApartmentPlanPage.xaml.cs">
       <DependentUpon>ApartmentPlanPage.xaml</DependentUpon>
     </Compile>
-    <Compile Include="View\ApartmentResidentsPage.xaml.cs">
+    <Compile Include="View\User pages\ApartmentResidentsPage.xaml.cs">
       <DependentUpon>ApartmentResidentsPage.xaml</DependentUpon>
     </Compile>
   </ItemGroup>
@@ -232,87 +233,87 @@
       <Generator>MSBuild:Compile</Generator>
       <SubType>Designer</SubType>
     </Page>
-    <Page Include="View\ApartmentChangesPage.xaml">
+    <Page Include="View\User pages\ApartmentChangesPage.xaml">
       <SubType>Designer</SubType>
       <Generator>MSBuild:Compile</Generator>
     </Page>
-    <Page Include="View\ApartmentChangesViewPage.xaml">
+    <Page Include="View\User pages\ApartmentChangesViewPage.xaml">
       <SubType>Designer</SubType>
       <Generator>MSBuild:Compile</Generator>
     </Page>
-    <Page Include="View\ApartmentDefectPage.xaml">
+    <Page Include="View\User pages\ApartmentDefectPage.xaml">
       <SubType>Designer</SubType>
       <Generator>MSBuild:Compile</Generator>
     </Page>
-    <Page Include="View\ApartmentDefectViewPage.xaml">
+    <Page Include="View\User pages\ApartmentDefectViewPage.xaml">
       <SubType>Designer</SubType>
       <Generator>MSBuild:Compile</Generator>
     </Page>
-    <Page Include="View\ApartmentNewChangePage.xaml">
+    <Page Include="View\User pages\ApartmentNewChangePage.xaml">
       <SubType>Designer</SubType>
       <Generator>MSBuild:Compile</Generator>
     </Page>
-    <Page Include="View\ApartmentNewDefect.xaml">
+    <Page Include="View\User pages\ApartmentNewDefect.xaml">
       <SubType>Designer</SubType>
       <Generator>MSBuild:Compile</Generator>
     </Page>
-    <Page Include="View\ApartmentPage.xaml">
+    <Page Include="View\User pages\ApartmentPage.xaml">
       <SubType>Designer</SubType>
       <Generator>MSBuild:Compile</Generator>
     </Page>
-    <Page Include="View\BmChangesPage.xaml">
+    <Page Include="View\Board member pages\BmChangesPage.xaml">
       <SubType>Designer</SubType>
       <Generator>MSBuild:Compile</Generator>
     </Page>
-    <Page Include="View\BmCreateChangePage.xaml">
+    <Page Include="View\Board member pages\BmCreateChangePage.xaml">
       <SubType>Designer</SubType>
       <Generator>MSBuild:Compile</Generator>
     </Page>
-    <Page Include="View\BmCreateDefectPage.xaml">
+    <Page Include="View\Board member pages\BmCreateDefectPage.xaml">
       <SubType>Designer</SubType>
       <Generator>MSBuild:Compile</Generator>
     </Page>
-    <Page Include="View\BmEditApartmentPage.xaml">
+    <Page Include="View\Board member pages\BmEditApartmentPage.xaml">
       <SubType>Designer</SubType>
       <Generator>MSBuild:Compile</Generator>
     </Page>
-    <Page Include="View\BmEditChangePage.xaml">
+    <Page Include="View\Board member pages\BmEditChangePage.xaml">
       <SubType>Designer</SubType>
       <Generator>MSBuild:Compile</Generator>
     </Page>
-    <Page Include="View\BmEditDefectPage.xaml">
+    <Page Include="View\Board member pages\BmEditDefectPage.xaml">
       <SubType>Designer</SubType>
       <Generator>MSBuild:Compile</Generator>
     </Page>
-    <Page Include="View\BmResidentsPage.xaml">
+    <Page Include="View\Board member pages\BmResidentsPage.xaml">
       <SubType>Designer</SubType>
       <Generator>MSBuild:Compile</Generator>
     </Page>
-    <Page Include="View\BmApartmentsPage.xaml">
+    <Page Include="View\Board member pages\BmApartmentsPage.xaml">
       <SubType>Designer</SubType>
       <Generator>MSBuild:Compile</Generator>
     </Page>
-    <Page Include="View\BmDefectsPage.xaml">
+    <Page Include="View\Board member pages\BmDefectsPage.xaml">
       <SubType>Designer</SubType>
       <Generator>MSBuild:Compile</Generator>
     </Page>
-    <Page Include="View\BmMainPage.xaml">
+    <Page Include="View\Board member pages\BmMainPage.xaml">
       <SubType>Designer</SubType>
       <Generator>MSBuild:Compile</Generator>
     </Page>
-    <Page Include="View\BmCreateApartmentPage.xaml">
+    <Page Include="View\Board member pages\BmCreateApartmentPage.xaml">
       <SubType>Designer</SubType>
       <Generator>MSBuild:Compile</Generator>
     </Page>
-    <Page Include="View\BmSingleChangePage.xaml">
+    <Page Include="View\Board member pages\BmSingleChangePage.xaml">
       <SubType>Designer</SubType>
       <Generator>MSBuild:Compile</Generator>
     </Page>
-    <Page Include="View\BmSingleDefectPage.xaml">
+    <Page Include="View\Board member pages\BmSingleDefectPage.xaml">
       <SubType>Designer</SubType>
       <Generator>MSBuild:Compile</Generator>
     </Page>
-    <Page Include="View\BmUsersPage.xaml">
+    <Page Include="View\Board member pages\BmUsersPage.xaml">
       <SubType>Designer</SubType>
       <Generator>MSBuild:Compile</Generator>
     </Page>
@@ -324,11 +325,11 @@
       <SubType>Designer</SubType>
       <Generator>MSBuild:Compile</Generator>
     </Page>
-    <Page Include="View\ApartmentPlanPage.xaml">
+    <Page Include="View\User pages\ApartmentPlanPage.xaml">
       <SubType>Designer</SubType>
       <Generator>MSBuild:Compile</Generator>
     </Page>
-    <Page Include="View\ApartmentResidentsPage.xaml">
+    <Page Include="View\User pages\ApartmentResidentsPage.xaml">
       <SubType>Designer</SubType>
       <Generator>MSBuild:Compile</Generator>
     </Page>
@@ -352,7 +353,9 @@
       <SubType>Designer</SubType>
     </AppxManifest>
   </ItemGroup>
-  <ItemGroup />
+  <ItemGroup>
+    <None Include="ApartmentManager_TemporaryKey.pfx" />
+  </ItemGroup>
   <PropertyGroup Condition=" '$(VisualStudioVersion)' == '' or '$(VisualStudioVersion)' &lt; '14.0' ">
     <VisualStudioVersion>14.0</VisualStudioVersion>
   </PropertyGroup>
diff --git a/ApartmentManager/ApartmentManager/Handler/ApartmentHandler.cs b/ApartmentManager/ApartmentManager/Handler/ApartmentHandler.cs
index b5ea6d2..b89680c 100644
--- a/ApartmentManager/ApartmentManager/Handler/ApartmentHandler.cs
+++ b/ApartmentManager/ApartmentManager/Handler/ApartmentHandler.cs
@@ -25,6 +25,10 @@ namespace ApartmentManager.Handler
         public ApartmentHandler(ApartmentViewModel apartmenViewModel)
         {
             ApartmentViewModel = apartmenViewModel;
+            if (CatalogSingleton.Instance.Apartment == null) GetApartment();
+            if (CatalogSingleton.Instance.Residents == null) GetApartmentResidents();
+            if (CatalogSingleton.Instance.Defects == null) GetApartmentDefects();
+            if (CatalogSingleton.Instance.Changes == null) GetApartmentChanges();
         }
 
 
@@ -36,9 +40,9 @@ namespace ApartmentManager.Handler
         {
             try
             {
-                string serializedApartment = ApiClient.GetData("api/Apartments/" + ApartmentViewModel.UserSingleton.CurrentUser.ApartmentId);
+                string serializedApartment = ApiClient.GetData("api/Apartments/" + UserSingleton.Instance.CurrentUser.ApartmentId);
                 Apartment apartment = JsonConvert.DeserializeObject<Apartment>(serializedApartment);
-                ApartmentViewModel.CatalogSingleton.Apartment = apartment;
+                CatalogSingleton.Instance.Apartment = apartment;
             }
             catch (Exception e)
             {
@@ -54,10 +58,10 @@ namespace ApartmentManager.Handler
             {
                 var residentsFromDatabase = ApiClient.GetData("api/ApartmentResidents/" + UserSingleton.Instance.CurrentUser.ApartmentId);
                 var residentlist = JsonConvert.DeserializeObject<ObservableCollection<Resident>>(residentsFromDatabase);
-                ApartmentViewModel.CatalogSingleton.Residents.Clear();
+                CatalogSingleton.Instance.Residents = new ObservableCollection<Resident>();
                 foreach (var resident in residentlist)
                 {
-                    ApartmentViewModel.CatalogSingleton.Residents.Add(resident);
+                    CatalogSingleton.Instance.Residents.Add(resident);
                 }
             }
             catch (Exception e)
@@ -167,10 +171,10 @@ namespace ApartmentManager.Handler
         public void GetApartmentDefects()
         {
             Defect Defect = new Defect();
-            Defect.ApartmentId = ApartmentViewModel.UserSingleton.CurrentUser.ApartmentId;
+            Defect.ApartmentId = UserSingleton.Instance.CurrentUser.ApartmentId;
             var defectsFromDatabase = ApiClient.GetData("api/ApartmentDefects/" + Defect.ApartmentId);
             var defecttlist = JsonConvert.DeserializeObject<ObservableCollection<Defect>>(defectsFromDatabase);
-            CatalogSingleton.Instance.Defects.Clear();
+            CatalogSingleton.Instance.Defects = new ObservableCollection<Defect>();
             foreach (var defect in defecttlist)
             {
                 defect.Pictures = JsonConvert.DeserializeObject<ObservableCollection<DefectPicture>>(ApiClient.GetData("api/DefectPicturesById/" + defect.DefectId));
@@ -269,16 +273,16 @@ namespace ApartmentManager.Handler
         /// </summary>
         public void GetApartmentChanges()
         {
-            ApartmentChange change = new ApartmentChange();
-            change.ApartmentId = ApartmentViewModel.UserSingleton.CurrentUser.ApartmentId;
-            var changesFromDatabase = ApiClient.GetData("api/ApartmentChangesByid/" + change.ApartmentId);
-            var changeslist = JsonConvert.DeserializeObject<ObservableCollection<ApartmentChange>>(changesFromDatabase);
-            CatalogSingleton.Instance.ApartmentChanges.Clear();
+            Change change = new Change();
+            change.ApartmentId = UserSingleton.Instance.CurrentUser.ApartmentId;
+            var changesFromDatabase = ApiClient.GetData("api/ChangesByApartmentId/" + change.ApartmentId);
+            var changeslist = JsonConvert.DeserializeObject<ObservableCollection<Change>>(changesFromDatabase);
+            CatalogSingleton.Instance.Changes = new ObservableCollection<Change>();
             foreach (var apartmentChange in changeslist)
             {
-                apartmentChange.Documents = JsonConvert.DeserializeObject<ObservableCollection<ChangeDocument>>(ApiClient.GetData("api/ChangeDocumentsById/" + apartmentChange.ChangeId));
-                apartmentChange.Comments = JsonConvert.DeserializeObject<ObservableCollection<ChangeComment>>(ApiClient.GetData("api/ChangeCommentsById/" + apartmentChange.ChangeId));
-                CatalogSingleton.Instance.ApartmentChanges.Add(apartmentChange);
+                apartmentChange.Documents = JsonConvert.DeserializeObject<ObservableCollection<ChangeDocument>>(ApiClient.GetData("api/DocumentsByChangeId/" + apartmentChange.ChangeId));
+                apartmentChange.Comments = JsonConvert.DeserializeObject<ObservableCollection<ChangeComment>>(ApiClient.GetData("api/CommentsByChangeId/" + apartmentChange.ChangeId));
+                CatalogSingleton.Instance.Changes.Add(apartmentChange);
             }
         }
         public void CreateChangeComment()
@@ -294,7 +298,7 @@ namespace ApartmentManager.Handler
                 {
                     var asd =ApiClient.PostData("api/ChangeComments/", Comment);
                 }
-                var response = ApiClient.GetData("api/ChangeCommentsById/" + CatalogSingleton.Instance.SelectedChange.ChangeId);
+                var response = ApiClient.GetData("api/CommentsByChangeId/" + CatalogSingleton.Instance.SelectedChange.ChangeId);
                 var commentlist = JsonConvert.DeserializeObject<ObservableCollection<ChangeComment>>(response);
 
                 CatalogSingleton.Instance.SelectedChange.Comments.Clear();
@@ -336,12 +340,12 @@ namespace ApartmentManager.Handler
         {
             try
             {
-                ApartmentChange change = ApartmentViewModel.NewChange;
+                Change change = ApartmentViewModel.NewChange;
                 change.ApartmentId = ApartmentViewModel.UserSingleton.CurrentUser.ApartmentId;
                 change.Status = "New";
                 change.UploadDate = DateTime.Now;
-                var response = ApiClient.PostData("api/ApartmentChanges/", change);
-                var changeResponse = JsonConvert.DeserializeObject<ApartmentChange>(response);
+                var response = ApiClient.PostData("api/Changes/", change);
+                var changeResponse = JsonConvert.DeserializeObject<Change>(response);
                 change.ChangeId = changeResponse.ChangeId;
                 if (change.Documents !=null)
                 {
diff --git a/ApartmentManager/ApartmentManager/Handler/BmApartmentsHandler.cs b/ApartmentManager/ApartmentManager/Handler/BmApartmentsHandler.cs
index 48a60e2..349f29c 100644
--- a/ApartmentManager/ApartmentManager/Handler/BmApartmentsHandler.cs
+++ b/ApartmentManager/ApartmentManager/Handler/BmApartmentsHandler.cs
@@ -16,6 +16,7 @@ namespace ApartmentManager.Handler
         public BmApartmentsHandler(BmApartmentsViewModel vm)
         {
             _vm = vm;
+            if (BmSingleton.Instance.Apartments == null) GetApartments();
         }
 
         public void GetApartments()
diff --git a/ApartmentManager/ApartmentManager/Handler/BmChangesHandler.cs b/ApartmentManager/ApartmentManager/Handler/BmChangesHandler.cs
index a32bbc2..87ea656 100644
--- a/ApartmentManager/ApartmentManager/Handler/BmChangesHandler.cs
+++ b/ApartmentManager/ApartmentManager/Handler/BmChangesHandler.cs
@@ -17,17 +17,18 @@ namespace ApartmentManager.Handler
         public BmChangesHandler(BmChangesViewModel vm)
         {
             _vm = vm;
+            if (BmSingleton.Instance.Changes == null) GetChanges();
         }
 
         public void GetChanges()
         {
-            var changes = JsonConvert.DeserializeObject<ObservableCollection<ApartmentChange>>(ApiClient.GetData("api/ApartmentChanges/"));
-            BmSingleton.Instance.ApartmentChanges.Clear();
+            var changes = JsonConvert.DeserializeObject<ObservableCollection<Change>>(ApiClient.GetData("api/Changes/"));
+            BmSingleton.Instance.Changes = new ObservableCollection<Change>();
             foreach (var change in changes)
             {
-                change.Documents = JsonConvert.DeserializeObject<ObservableCollection<ChangeDocument>>(ApiClient.GetData("api/ChangeDocumentsById/" + change.ChangeId));
-                change.Comments = JsonConvert.DeserializeObject<ObservableCollection<ChangeComment>>(ApiClient.GetData("api/ChangeCommentsById/" + change.ChangeId));
-                BmSingleton.Instance.ApartmentChanges.Add(change);
+                change.Documents = JsonConvert.DeserializeObject<ObservableCollection<ChangeDocument>>(ApiClient.GetData("api/DocumentsByChangeId/" + change.ChangeId));
+                change.Comments = JsonConvert.DeserializeObject<ObservableCollection<ChangeComment>>(ApiClient.GetData("api/CommentsByChangeId/" + change.ChangeId));
+                BmSingleton.Instance.Changes.Add(change);
             }
         }
 
@@ -38,14 +39,14 @@ namespace ApartmentManager.Handler
                 _vm.ChangeTemplate.Status = "New";
                 _vm.ChangeTemplate.UploadDate = DateTime.Now;
                 if (_vm.ChangeTemplate.Documents == null) _vm.ChangeTemplate.Documents = new ObservableCollection<ChangeDocument>();
-                var response = JsonConvert.DeserializeObject<ApartmentChange>(ApiClient.PostData("api/ApartmentChanges/", _vm.ChangeTemplate));
+                var response = JsonConvert.DeserializeObject<Change>(ApiClient.PostData("api/Changes/", _vm.ChangeTemplate));
                 foreach (var changeDocument in _vm.ChangeTemplate.Documents)
                 {
                     changeDocument.ChangeId = response.ChangeId;
                     ApiClient.PostData("api/ChangeDocuments/", changeDocument);
                 }
                 GetChanges();
-                _vm.ChangeTemplate = new ApartmentChange();
+                _vm.ChangeTemplate = new Change();
             }
             catch (Exception e)
             {
@@ -56,7 +57,7 @@ namespace ApartmentManager.Handler
         {
             try
             {
-                ApiClient.PutData("api/ApartmentChanges/" + _vm.ChangeTemplate.ChangeId, _vm.ChangeTemplate);
+                ApiClient.PutData("api/Changes/" + _vm.ChangeTemplate.ChangeId, _vm.ChangeTemplate);
                 var deletedChangeDocuments = new List<ChangeDocument>(_vm.DeletedChangeDocuments);
                 var addedChangeDocuments = new List<ChangeDocument>(_vm.AddedChangeDocuments);
 
@@ -82,8 +83,8 @@ namespace ApartmentManager.Handler
         {
             try
             {
-                ApiClient.DeleteData("api/ApartmentChanges/" + _vm.ChangeTemplate.ChangeId);
-                BmSingleton.Instance.ApartmentChanges.Remove(_vm.ChangeTemplate);
+                ApiClient.DeleteData("api/Changes/" + _vm.ChangeTemplate.ChangeId);
+                BmSingleton.Instance.Changes.Remove(_vm.ChangeTemplate);
                 GetChanges();
             }
             catch (Exception e)
@@ -94,7 +95,7 @@ namespace ApartmentManager.Handler
 
         public void ClearChangeTemplate()
         {
-            _vm.ChangeTemplate = new ApartmentChange();
+            _vm.ChangeTemplate = new Change();
         }
 
         public async void UploadChangeDocument()
diff --git a/ApartmentManager/ApartmentManager/Handler/BmDefectsHandler.cs b/ApartmentManager/ApartmentManager/Handler/BmDefectsHandler.cs
index 919d026..27a9680 100644
--- a/ApartmentManager/ApartmentManager/Handler/BmDefectsHandler.cs
+++ b/ApartmentManager/ApartmentManager/Handler/BmDefectsHandler.cs
@@ -17,12 +17,13 @@ namespace ApartmentManager.Handler
         public BmDefectsHandler(BmDefectsViewModel vm)
         {
             _vm = vm;
+            if (BmSingleton.Instance.Defects == null) GetDefects();
         }
 
         public void GetDefects()
         {
             var defects = JsonConvert.DeserializeObject<ObservableCollection<Defect>>(ApiClient.GetData("api/Defects/"));
-            BmSingleton.Instance.Defects.Clear();
+            BmSingleton.Instance.Defects = new ObservableCollection<Defect>();
             foreach (var defect in defects)
             {
                 defect.Pictures = JsonConvert.DeserializeObject<ObservableCollection<DefectPicture>>(ApiClient.GetData("api/DefectPicturesById/" + defect.DefectId));
diff --git a/ApartmentManager/ApartmentManager/Handler/BmResidentsHandler.cs b/ApartmentManager/ApartmentManager/Handler/BmResidentsHandler.cs
index 7e93393..1e43f4d 100644
--- a/ApartmentManager/ApartmentManager/Handler/BmResidentsHandler.cs
+++ b/ApartmentManager/ApartmentManager/Handler/BmResidentsHandler.cs
@@ -4,11 +4,7 @@ using ApartmentManager.Singletons;
 using ApartmentManager.ViewModel;
 using Newtonsoft.Json;
 using System;
-using System.Collections.Generic;
 using System.Collections.ObjectModel;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 using Windows.UI.Popups;
 
 namespace ApartmentManager.Handler
@@ -20,12 +16,13 @@ namespace ApartmentManager.Handler
         public BmResidentsHandler(BmResidentsViewModel vm)
         {
             _vm = vm;
+            if (BmSingleton.Instance.Residents == null) GetResidents();
         }
 
         public void GetResidents()
         {
             var residents = JsonConvert.DeserializeObject<ObservableCollection<Resident>>(ApiClient.GetData("api/Residents/"));
-            BmSingleton.Instance.Residents.Clear();
+            BmSingleton.Instance.Residents = new ObservableCollection<Resident>();
             foreach (var resident in residents) BmSingleton.Instance.Residents.Add(resident);
         }
 
diff --git a/ApartmentManager/ApartmentManager/Handler/BmUsersHandler.cs b/ApartmentManager/ApartmentManager/Handler/BmUsersHandler.cs
index 5fe3a92..cf07594 100644
--- a/ApartmentManager/ApartmentManager/Handler/BmUsersHandler.cs
+++ b/ApartmentManager/ApartmentManager/Handler/BmUsersHandler.cs
@@ -20,12 +20,13 @@ namespace ApartmentManager.Handler
         public BmUsersHandler(BmUsersViewModel vm)
         {
             _vm = vm;
+            if (BmSingleton.Instance.Users == null) GetUsers();
         }
 
         public void GetUsers()
         {
             var users = JsonConvert.DeserializeObject<ObservableCollection<User>>(ApiClient.GetData("api/Users/"));
-            BmSingleton.Instance.Users.Clear();
+            BmSingleton.Instance.Users = new ObservableCollection<User>();
             foreach (var user in users) BmSingleton.Instance.Users.Add(user);
         }
 
diff --git a/ApartmentManager/ApartmentManager/Handler/LoginHandler.cs b/ApartmentManager/ApartmentManager/Handler/LoginHandler.cs
index 9360f97..02e6009 100644
--- a/ApartmentManager/ApartmentManager/Handler/LoginHandler.cs
+++ b/ApartmentManager/ApartmentManager/Handler/LoginHandler.cs
@@ -75,25 +75,10 @@ namespace ApartmentManager.Handler
                 // suppressing the initial entrance animation.
                 if (UserSingleton.Instance.CurrentUser.IsBm)
                 {
-                    BmApartmentsViewModel bavm = new BmApartmentsViewModel();
-                    BmUsersViewModel buvm = new BmUsersViewModel();
-                    BmResidentsViewModel brvm = new BmResidentsViewModel();
-                    BmDefectsViewModel bdvm = new BmDefectsViewModel();
-                    BmChangesViewModel bcvm = new BmChangesViewModel();
-                    bavm.BmApartmentsHandler.GetApartments();
-                    buvm.BmUsersHandler.GetUsers();
-                    brvm.BmResidentsHandler.GetResidents();
-                    bdvm.BmDefectsHandler.GetDefects();
-                    bcvm.BmChangesHandler.GetChanges();
                     appShell.AppFrame.Navigate(typeof(BmMainPage));
                 }
                 else
                 {
-                    ApartmentViewModel avm = new ApartmentViewModel();
-                    avm.ApartmentHandler.GetApartmentResidents();
-                    avm.ApartmentHandler.GetApartment();
-                    avm.ApartmentHandler.GetApartmentDefects();
-                    avm.ApartmentHandler.GetApartmentChanges();
                     appShell.AppFrame.Navigate(typeof(ApartmentPage));
                 }
             }
diff --git a/ApartmentManager/ApartmentManager/Singletons/BmSingleton.cs b/ApartmentManager/ApartmentManager/Singletons/BmSingleton.cs
index c12f852..255c4ce 100644
--- a/ApartmentManager/ApartmentManager/Singletons/BmSingleton.cs
+++ b/ApartmentManager/ApartmentManager/Singletons/BmSingleton.cs
@@ -12,15 +12,8 @@ namespace ApartmentManager.Singletons
         public ObservableCollection<User> Users { get; set; }
         public ObservableCollection<Resident> Residents { get; set; }
         public ObservableCollection<Defect> Defects { get; set; }
-        public ObservableCollection<ApartmentChange> ApartmentChanges { get; set; }
+        public ObservableCollection<Change> Changes { get; set; }
 
-        private BmSingleton()
-        {
-            Apartments = new ObservableCollection<Apartment>();
-            Users = new ObservableCollection<User>();
-            Residents = new ObservableCollection<Resident>();
-            Defects = new ObservableCollection<Defect>();
-            ApartmentChanges = new ObservableCollection<ApartmentChange>();
-        }
+        private BmSingleton() { }
     }
 }
diff --git a/ApartmentManager/ApartmentManager/Singletons/CatalogSingleton.cs b/ApartmentManager/ApartmentManager/Singletons/CatalogSingleton.cs
index ee101c6..f32dd7a 100644
--- a/ApartmentManager/ApartmentManager/Singletons/CatalogSingleton.cs
+++ b/ApartmentManager/ApartmentManager/Singletons/CatalogSingleton.cs
@@ -18,18 +18,15 @@ namespace ApartmentManager.Singletons
         public ObservableCollection<Resident> Residents { get; set; }
         ////////// For Defects //////////
         public ObservableCollection<Defect> Defects { get; set; }
-        public ApartmentChange SelectedChange { get; set; }
+        public Change SelectedChange { get; set; }
         ////////// For Defects //////////
-        public ObservableCollection<ApartmentChange> ApartmentChanges { get; set; }
+        public ObservableCollection<Change> Changes { get; set; }
         public Defect SelectedDefect { get; set; }     
         ////////// Constructor //////////
         private CatalogSingleton()
         {
-            ApartmentChanges = new ObservableCollection<ApartmentChange>();
-            Residents = new ObservableCollection<Resident>();
-            Defects = new ObservableCollection<Defect>();
             SelectedDefect = new Defect();
-            SelectedChange = new ApartmentChange();
+            SelectedChange = new Change();
         }   
     }
 }
diff --git a/ApartmentManager/ApartmentManager/ViewModel/ApartmentViewModel.cs b/ApartmentManager/ApartmentManager/ViewModel/ApartmentViewModel.cs
index bb126b4..dad1ad8 100644
--- a/ApartmentManager/ApartmentManager/ViewModel/ApartmentViewModel.cs
+++ b/ApartmentManager/ApartmentManager/ViewModel/ApartmentViewModel.cs
@@ -31,7 +31,7 @@ namespace ApartmentManager.ViewModel
         private DefectComment _newDefectComment;
         //// For Changes///
         private ChangeComment _newChangeComment;
-        private ApartmentChange _newApartmentChange;
+        private Change _newChange;
         private ChangeDocument _selectedChangeDocument;
         ////////// Resident relay commands//////////
         public ICommand CreateResidentCommand { get; set; }
@@ -64,7 +64,7 @@ namespace ApartmentManager.ViewModel
 
             NewChangeComment = new ChangeComment();
             SelectedChangeDocument = new ChangeDocument();
-            NewChange = new ApartmentChange();
+            NewChange = new Change();
             ////////// Handler //////////
             ApartmentHandler = new ApartmentHandler(this);
             ////////// Singletons //////////
@@ -136,12 +136,12 @@ namespace ApartmentManager.ViewModel
                 OnPropertyChanged();
             }
         }
-        public ApartmentChange NewChange
+        public Change NewChange
         {
-            get => _newApartmentChange;
+            get => _newChange;
             set
             {
-                _newApartmentChange = value;
+                _newChange = value;
                 OnPropertyChanged();
             }
         }
diff --git a/ApartmentManager/ApartmentManager/ViewModel/BmChangesViewModel.cs b/ApartmentManager/ApartmentManager/ViewModel/BmChangesViewModel.cs
index 68aa14d..990b367 100644
--- a/ApartmentManager/ApartmentManager/ViewModel/BmChangesViewModel.cs
+++ b/ApartmentManager/ApartmentManager/ViewModel/BmChangesViewModel.cs
@@ -26,7 +26,7 @@ namespace ApartmentManager.ViewModel
         public ICommand DeleteChangeDocumentTempCommand { get; }
         public ICommand CreateChangeCommentCommand { get; }
 
-        private static ApartmentChange _changeTemplate = new ApartmentChange();
+        private static Change _changeTemplate = new Change();
         private static ChangeDocument _selectedChangeDocument = new ChangeDocument();
         private static List<ChangeDocument> _deletedChangeDocuments = new List<ChangeDocument>();
         private static List<ChangeDocument> _addedChangeDocuments = new List<ChangeDocument>();
@@ -47,7 +47,7 @@ namespace ApartmentManager.ViewModel
             CreateChangeCommentCommand = new RelayCommand(BmChangesHandler.CreateChangeComment);
         }
 
-        public ApartmentChange ChangeTemplate
+        public Change ChangeTemplate
         {
             get => _changeTemplate;
             set
-- 
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