Fix error loading Add/Edit Transaction Item page

Groceries/Stores/StoreForm.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">
@@ -45,7 +45,8 @@
 
     protected override async Task OnInitializedAsync()
     {
-        retailers = await DbContext.Retailers
+        using var dbContext = DbContextFactory.CreateDbContext();
+        retailers = await dbContext.Retailers
             .OrderBy(retailer => retailer.Name)
             .ToArrayAsync();
     }

Groceries/Stores/StoresController.cs

@@ -8,11 +8,11 @@ using Microsoft.EntityFrameworkCore;
 [Route("/stores")]
 public class StoresController : Controller
 {
-    private readonly AppDbContext dbContext;
+    private readonly IDbContextFactory<AppDbContext> dbContextFactory;
 
-    public StoresController(AppDbContext dbContext)
+    public StoresController(IDbContextFactory<AppDbContext> dbContextFactory)
     {
-        this.dbContext = dbContext;
+        this.dbContextFactory = dbContextFactory;
     }
 
     [HttpGet]
@@ -32,6 +32,8 @@ public class StoresController : Controller
     [HttpPost("new")]
     public async Task<IResult> NewStore(Guid retailerId, string name, string? address)
     {
+        using var dbContext = dbContextFactory.CreateDbContext();
+
         var store = new Store(retailerId, name, address);
         dbContext.Stores.Add(store);
 
@@ -45,6 +47,8 @@ public class StoresController : Controller
     [HttpGet("edit/{id}")]
     public async Task<IResult> EditStore(Guid id)
     {
+        using var dbContext = dbContextFactory.CreateDbContext();
+
         var store = await dbContext.Stores
             .SingleOrDefaultAsync(store => store.Id == id, HttpContext.RequestAborted);
 
@@ -61,6 +65,8 @@ public class StoresController : Controller
     [HttpPost("edit/{id}")]
     public async Task<IResult> EditStore(Guid id, Guid retailerId, string name, string? address, string? returnUrl)
     {
+        using var dbContext = dbContextFactory.CreateDbContext();
+
         var store = new Store(id, retailerId, name, address);
         dbContext.Stores.Update(store);
 

Groceries/Stores/StoresPage.razor

@@ -2,7 +2,9 @@
 @using Microsoft.EntityFrameworkCore
 
 @layout Layout
-@inject AppDbContext DbContext
+
+@implements IDisposable
+@inject IDbContextFactory<AppDbContext> DbContextFactory
 
 <PageTitle>Groceries &ndash; Stores</PageTitle>
 
@@ -39,6 +41,7 @@
         public int TransactionsCount { get; init; }
     }
 
+    private AppDbContext? dbContext;
     private IQueryable<StoreModel> stores = null!;
     private PaginationState pagination = new();
 
@@ -47,7 +50,9 @@
 
     protected override void OnParametersSet()
     {
-        var storesQuery = DbContext.Stores.AsQueryable();
+        dbContext ??= DbContextFactory.CreateDbContext();
+
+        var storesQuery = dbContext.Stores.AsQueryable();
         if (!string.IsNullOrEmpty(Search))
         {
             var searchPattern = $"%{Search}%";
@@ -66,4 +71,9 @@
             .OrderBy(store => store.Retailer)
             .ThenBy(store => store.Name);
     }
+
+    public void Dispose()
+    {
+        dbContext?.Dispose();
+    }
 }