Fix error loading Add/Edit Transaction Item page

Groceries/Transactions/EditTransactionItemPage.razor

@@ -3,7 +3,7 @@
 
 @layout Layout
 
-@inject AppDbContext DbContext
+@inject IDbContextFactory<AppDbContext> DbContextFactory
 
 <PageTitle>Groceries &ndash; Edit Transaction Item</PageTitle>
 
@@ -19,7 +19,7 @@
 
 <div class="row">
     <button class="button button--primary" type="submit" form="editTransactionItem">Update</button>
-    <a class="button" href="/transaction/new/items">Cancel</a>
+    <a class="button" href="/transactions/new/items">Cancel</a>
     <span class="row__fill"></span>
     <button class="button button--danger" type="submit" form="deleteTransactionItem">Remove</button>
 </div>
@@ -35,7 +35,8 @@
 
     protected override async Task OnParametersSetAsync()
     {
-        store = await DbContext.Stores
+        using var dbContext = DbContextFactory.CreateDbContext();
+        store = await dbContext.Stores
             .Where(store => store.Id == Transaction.StoreId)
             .Select(store => string.Concat(store.Retailer!.Name, " ", store.Name))
             .SingleAsync();

Groceries/Transactions/EditTransactionPromotionPage.razor

@@ -3,7 +3,7 @@
 
 @layout Layout
 
-@inject AppDbContext DbContext
+@inject IDbContextFactory<AppDbContext> DbContextFactory
 
 <PageTitle>Groceries &ndash; Edit Transaction Promotion</PageTitle>
 
@@ -35,7 +35,8 @@
 
     protected override async Task OnParametersSetAsync()
     {
-        store = await DbContext.Stores
+        using var dbContext = DbContextFactory.CreateDbContext();
+        store = await dbContext.Stores
             .Where(store => store.Id == Transaction.StoreId)
             .Select(store => string.Concat(store.Retailer!.Name, " ", store.Name))
             .SingleAsync();

Groceries/Transactions/NewTransactionItemPage.razor

@@ -3,7 +3,7 @@
 
 @layout Layout
 
-@inject AppDbContext DbContext
+@inject IDbContextFactory<AppDbContext> DbContextFactory
 
 <PageTitle>Groceries &ndash; New Transaction Item</PageTitle>
 
@@ -16,7 +16,7 @@
 <TransactionItemForm TransactionItem="TransactionItem">
     <div class="row">
         <button class="button button--primary" type="submit">Add</button>
-        <a class="button" href="/transaction/new/items">Cancel</a>
+        <a class="button" href="/transactions/new/items">Cancel</a>
     </div>
 </TransactionItemForm>
 
@@ -31,7 +31,8 @@
 
     protected override async Task OnParametersSetAsync()
     {
-        store = await DbContext.Stores
+        using var dbContext = DbContextFactory.CreateDbContext();
+        store = await dbContext.Stores
             .Where(store => store.Id == Transaction.StoreId)
             .Select(store => string.Concat(store.Retailer!.Name, " ", store.Name))
             .SingleAsync();

Groceries/Transactions/NewTransactionItemsPage.razor

@@ -2,7 +2,8 @@
 @using Microsoft.EntityFrameworkCore
 
 @layout Layout
-@inject AppDbContext DbContext
+
+@inject IDbContextFactory<AppDbContext> DbContextFactory
 
 <PageTitle>Groceries &ndash; New Transaction</PageTitle>
 
@@ -78,13 +79,15 @@
 
     protected override async Task OnParametersSetAsync()
     {
-        store = await DbContext.Stores
+        using var dbContext = DbContextFactory.CreateDbContext();
+
+        store = await dbContext.Stores
             .Where(store => store.Id == Transaction.StoreId)
             .Select(store => string.Concat(store.Retailer!.Name, " ", store.Name))
             .SingleAsync();
 
         var itemIds = Transaction.Items.Select(item => item.ItemId);
-        itemNames = await DbContext.Items
+        itemNames = await dbContext.Items
             .Where(item => itemIds.Contains(item.Id))
             .ToDictionaryAsync(item => item.Id, item => string.Concat(item.Brand, " ", item.Name));
     }

Groceries/Transactions/NewTransactionPage.razor

@@ -3,7 +3,7 @@
 
 @layout Layout
 
-@inject AppDbContext DbContext
+@inject IDbContextFactory<AppDbContext> DbContextFactory
 
 <PageTitle>Groceries &ndash; New Transaction</PageTitle>
 
@@ -41,7 +41,8 @@
 
     protected override async Task OnInitializedAsync()
     {
-        stores = await DbContext.Stores
+        using var dbContext = DbContextFactory.CreateDbContext();
+        stores = await dbContext.Stores
             .OrderBy(store => store.Retailer!.Name)
             .ThenBy(store => store.Name)
             .Select(store => new StoreModel(store.Id, string.Concat(store.Retailer!.Name, " ", store.Name)))

Groceries/Transactions/NewTransactionPromotionPage.razor

@@ -3,7 +3,7 @@
 
 @layout Layout
 
-@inject AppDbContext DbContext
+@inject IDbContextFactory<AppDbContext> DbContextFactory
 
 <PageTitle>Groceries &ndash; New Transaction Promotion</PageTitle>
 
@@ -28,7 +28,8 @@
 
     protected override async Task OnParametersSetAsync()
     {
-        store = await DbContext.Stores
+        using var dbContext = DbContextFactory.CreateDbContext();
+        store = await dbContext.Stores
             .Where(store => store.Id == Transaction.StoreId)
             .Select(store => string.Concat(store.Retailer!.Name, " ", store.Name))
             .SingleAsync();

Groceries/Transactions/NewTransactionPromotionsPage.razor

@@ -2,7 +2,8 @@
 @using Microsoft.EntityFrameworkCore
 
 @layout Layout
-@inject AppDbContext DbContext
+
+@inject IDbContextFactory<AppDbContext> DbContextFactory
 
 <PageTitle>Groceries &ndash; New Transaction</PageTitle>
 
@@ -64,7 +65,8 @@
 
     protected override async Task OnParametersSetAsync()
     {
-        store = await DbContext.Stores
+        using var dbContext = DbContextFactory.CreateDbContext();
+        store = await dbContext.Stores
             .Where(store => store.Id == Transaction.StoreId)
             .Select(store => string.Concat(store.Retailer!.Name, " ", store.Name))
             .SingleAsync();

Groceries/Transactions/TransactionItemForm.razor

@@ -1,7 +1,7 @@
 @using Groceries.Data
 @using Microsoft.EntityFrameworkCore
 
-@inject AppDbContext DbContext
+@inject IDbContextFactory<AppDbContext> DbContextFactory
 
 <form method="post" @attributes="AdditionalAttributes">
     @* Ensure form action/method are used for implicit submission instead of barcode button *@
@@ -93,11 +93,12 @@
     {
         barcode = TransactionItem.Item?.Barcodes.FirstOrDefault();
 
-        items = await DbContext.Items
+        using var dbContext = DbContextFactory.CreateDbContext();
+        items = await dbContext.Items
             .OrderBy(item => item.Brand)
             .ThenBy(item => item.Name)
             .GroupJoin(
-                DbContext.ItemPurchases.Where(purchase => purchase.IsLastPurchase),
+                dbContext.ItemPurchases.Where(purchase => purchase.IsLastPurchase),
                 item => item.Id,
                 lastPurchase => lastPurchase.ItemId,
                 (item, purchases) => new { item, purchases })

Groceries/Transactions/TransactionPromotionForm.razor

@@ -1,7 +1,7 @@
 @using Groceries.Data
 @using Microsoft.EntityFrameworkCore
 
-@inject AppDbContext DbContext
+@inject IDbContextFactory<AppDbContext> DbContextFactory
 
 <form method="post" @attributes="AdditionalAttributes">
     <div class="form-field">
@@ -56,8 +56,9 @@
     {
         selectedItemIds = Promotion?.Items.Select(item => item.Id).ToArray() ?? [];
 
+        using var dbContext = DbContextFactory.CreateDbContext();
         var itemIds = Transaction.Items.Select(item => item.ItemId);
-        itemNames = await DbContext.Items
+        itemNames = await dbContext.Items
             .Where(item => itemIds.Contains(item.Id))
             .ToDictionaryAsync(item => item.Id, item => string.Concat(item.Brand, " ", item.Name));
     }

Groceries/Transactions/TransactionsController.cs

@@ -9,11 +9,11 @@ using System.Text.Json;
 [Route("/transactions")]
 public class TransactionsController : Controller
 {
-    private readonly AppDbContext dbContext;
+    private readonly IDbContextFactory<AppDbContext> dbContextFactory;
 
-    public TransactionsController(AppDbContext dbContext)
+    public TransactionsController(IDbContextFactory<AppDbContext> dbContextFactory)
     {
-        this.dbContext = dbContext;
+        this.dbContextFactory = dbContextFactory;
     }
 
     [HttpGet]
@@ -70,6 +70,8 @@ public class TransactionsController : Controller
         Item? item = null;
         if (barcodeData != null && barcodeFormat != null)
         {
+            using var dbContext = dbContextFactory.CreateDbContext();
+
             item = await dbContext.Items
                 .Where(item => item.Barcodes.Any(barcode => barcode.BarcodeData == barcodeData))
                 .OrderByDescending(item => item.UpdatedAt)
@@ -105,6 +107,8 @@ public class TransactionsController : Controller
             return Results.LocalRedirect("/transactions/new");
         }
 
+        using var dbContext = dbContextFactory.CreateDbContext();
+
         var itemId = await dbContext.Items
             .Where(item => EF.Functions.ILike(item.Brand, brand) && EF.Functions.ILike(item.Name, name))
             .Select(item => item.Id)
@@ -171,6 +175,8 @@ public class TransactionsController : Controller
             return Results.LocalRedirect("/transactions/new/items");
         }
 
+        using var dbContext = dbContextFactory.CreateDbContext();
+
         var itemId = await dbContext.Items
             .Where(item => EF.Functions.ILike(item.Brand, brand) && EF.Functions.ILike(item.Name, name))
             .Select(item => item.Id)
@@ -235,6 +241,8 @@ public class TransactionsController : Controller
             return Results.LocalRedirect("/transactions/new");
         }
 
+        using var dbContext = dbContextFactory.CreateDbContext();
+
         // Work around EF trying to insert items by explicitly tracking them as unchanged
         dbContext.Items.AttachRange(
             transaction.Items

Groceries/Transactions/TransactionsPage.razor

@@ -1,7 +1,10 @@
 @using Groceries.Data
+@using Microsoft.EntityFrameworkCore
 
 @layout Layout
-@inject AppDbContext DbContext
+
+@implements IDisposable
+@inject IDbContextFactory<AppDbContext> DbContextFactory
 
 <PageTitle>Groceries &ndash; Transactions</PageTitle>
 
@@ -35,14 +38,16 @@
         public int TotalItems { get; init; }
     }
 
+    private AppDbContext? dbContext;
     private IQueryable<TransactionModel> transactions = null!;
     private PaginationState pagination = new();
 
     protected override void OnParametersSet()
     {
-        transactions = DbContext.Transactions
+        dbContext ??= DbContextFactory.CreateDbContext();
+        transactions = dbContext.Transactions
             .Join(
-                DbContext.TransactionTotals,
+                dbContext.TransactionTotals,
                 transaction => transaction.Id,
                 transactionTotal => transactionTotal.TransactionId,
                 (transaction, transactionTotal) => new TransactionModel
@@ -55,4 +60,9 @@
                 })
             .OrderByDescending(transaction => transaction.CreatedAt);
     }
+
+    public void Dispose()
+    {
+        dbContext?.Dispose();
+    }
 }