Add workarounds for API breaking changes introduced in Entity Framework Core 3.x

src/OpenIddict.EntityFrameworkCore/Configurations/OpenIddictApplicationConfiguration.cs

@@ -40,7 +40,10 @@ namespace OpenIddict.EntityFrameworkCore
 
             builder.HasKey(application => application.Id);
 
-            builder.HasIndex(application => application.ClientId)
+            // Warning: the non-generic overlord is deliberately used to work around
+            // a breaking change introduced in Entity Framework Core 3.x (where a
+            // generic entity type builder is now returned by the HasIndex() method).
+            builder.HasIndex(nameof(OpenIddictApplication.ClientId))
                    .IsUnique();
 
             builder.Property(application => application.ClientId)

src/OpenIddict.EntityFrameworkCore/Configurations/OpenIddictScopeConfiguration.cs

@@ -36,7 +36,10 @@ namespace OpenIddict.EntityFrameworkCore
 
             builder.HasKey(scope => scope.Id);
 
-            builder.HasIndex(scope => scope.Name)
+            // Warning: the non-generic overlord is deliberately used to work around
+            // a breaking change introduced in Entity Framework Core 3.x (where a
+            // generic entity type builder is now returned by the HasIndex() method).
+            builder.HasIndex(nameof(OpenIddictScope.Name))
                    .IsUnique();
 
             builder.Property(scope => scope.ConcurrencyToken)

src/OpenIddict.EntityFrameworkCore/Configurations/OpenIddictTokenConfiguration.cs

@@ -40,7 +40,10 @@ namespace OpenIddict.EntityFrameworkCore
 
             builder.HasKey(token => token.Id);
 
-            builder.HasIndex(token => token.ReferenceId)
+            // Warning: the non-generic overlord is deliberately used to work around
+            // a breaking change introduced in Entity Framework Core 3.x (where a
+            // generic entity type builder is now returned by the HasIndex() method).
+            builder.HasIndex(nameof(OpenIddictToken.ReferenceId))
                    .IsUnique();
 
             builder.HasIndex(

src/OpenIddict.EntityFrameworkCore/Stores/OpenIddictAuthorizationStore.cs

@@ -848,7 +848,13 @@ namespace OpenIddict.EntityFrameworkCore
 
             if (!string.IsNullOrEmpty(identifier))
             {
-                var application = await Applications.FindAsync(new object[] { ConvertIdentifierFromString(identifier) }, cancellationToken);
+                var key = ConvertIdentifierFromString(identifier);
+
+                // Warning: FindAsync() is deliberately not used to work around a breaking change introduced
+                // in Entity Framework Core 3.x (where a ValueTask instead of a Task is now returned).
+                var application = await Applications.AsQueryable()
+                    .FirstOrDefaultAsync(element => element.Id.Equals(key), cancellationToken);
+
                 if (application == null)
                 {
                     throw new InvalidOperationException("The application associated with the authorization cannot be found.");

src/OpenIddict.EntityFrameworkCore/Stores/OpenIddictTokenStore.cs

@@ -909,7 +909,13 @@ namespace OpenIddict.EntityFrameworkCore
 
             if (!string.IsNullOrEmpty(identifier))
             {
-                var application = await Applications.FindAsync(new object[] { ConvertIdentifierFromString(identifier) }, cancellationToken);
+                var key = ConvertIdentifierFromString(identifier);
+
+                // Warning: FindAsync() is deliberately not used to work around a breaking change introduced
+                // in Entity Framework Core 3.x (where a ValueTask instead of a Task is now returned).
+                var application = await Applications.AsQueryable()
+                    .FirstOrDefaultAsync(element => element.Id.Equals(key), cancellationToken);
+
                 if (application == null)
                 {
                     throw new InvalidOperationException("The application associated with the token cannot be found.");
@@ -955,7 +961,13 @@ namespace OpenIddict.EntityFrameworkCore
 
             if (!string.IsNullOrEmpty(identifier))
             {
-                var authorization = await Authorizations.FindAsync(new object[] { ConvertIdentifierFromString(identifier) }, cancellationToken);
+                var key = ConvertIdentifierFromString(identifier);
+
+                // Warning: FindAsync() is deliberately not used to work around a breaking change introduced
+                // in Entity Framework Core 3.x (where a ValueTask instead of a Task is now returned).
+                var authorization = await Authorizations.AsQueryable()
+                    .FirstOrDefaultAsync(element => element.Id.Equals(key), cancellationToken);
+
                 if (authorization == null)
                 {
                     throw new InvalidOperationException("The authorization associated with the token cannot be found.");