Return default value when entity ttl is retrieved with entity cache enabled set to false

src/Config/ObjectModel/RuntimeConfig.cs

@@ -373,7 +373,6 @@ public RuntimeConfig(
         }
 
         SetupDataSourcesUsed();
-
     }
 
     /// <summary>
@@ -529,12 +528,13 @@ Runtime is not null && Runtime.Host is not null
 
     /// <summary>
     /// Returns the ttl-seconds value for a given entity.
-    /// If the property is not set, returns the global default value set in the runtime config.
-    /// If the global default value is not set, the default value is used (5 seconds).
+    /// If the entity explicitly sets ttl-seconds, that value is used.
+    /// Otherwise, falls back to the global cache TTL setting.
+    /// Callers are responsible for checking whether caching is enabled before using the result.
     /// </summary>
     /// <param name="entityName">Name of the entity to check cache configuration.</param>
     /// <returns>Number of seconds (ttl) that a cache entry should be valid before cache eviction.</returns>
-    /// <exception cref="DataApiBuilderException">Raised when an invalid entity name is provided or if the entity has caching disabled.</exception>
+    /// <exception cref="DataApiBuilderException">Raised when an invalid entity name is provided.</exception>
     public virtual int GetEntityCacheEntryTtl(string entityName)
     {
         if (!Entities.TryGetValue(entityName, out Entity? entityConfig))
@@ -545,31 +545,23 @@ public virtual int GetEntityCacheEntryTtl(string entityName)
                 subStatusCode: DataApiBuilderException.SubStatusCodes.EntityNotFound);
         }
 
-        if (!entityConfig.IsCachingEnabled)
-        {
-            throw new DataApiBuilderException(
-                message: $"{entityName} does not have caching enabled.",
-                statusCode: HttpStatusCode.BadRequest,
-                subStatusCode: DataApiBuilderException.SubStatusCodes.NotSupported);
-        }
-
-        if (entityConfig.Cache.UserProvidedTtlOptions)
+        if (entityConfig.Cache is not null && entityConfig.Cache.UserProvidedTtlOptions)
         {
             return entityConfig.Cache.TtlSeconds.Value;
         }
-        else
-        {
-            return GlobalCacheEntryTtl();
-        }
+
+        return GlobalCacheEntryTtl();
     }
 
     /// <summary>
     /// Returns the cache level value for a given entity.
-    /// If the property is not set, returns the default (L1L2) for a given entity.
+    /// If the entity explicitly sets level, that value is used.
+    /// Otherwise, falls back to the global cache level or the default.
+    /// Callers are responsible for checking whether caching is enabled before using the result.
     /// </summary>
     /// <param name="entityName">Name of the entity to check cache configuration.</param>
     /// <returns>Cache level that a cache entry should be stored in.</returns>
-    /// <exception cref="DataApiBuilderException">Raised when an invalid entity name is provided or if the entity has caching disabled.</exception>
+    /// <exception cref="DataApiBuilderException">Raised when an invalid entity name is provided.</exception>
     public virtual EntityCacheLevel GetEntityCacheEntryLevel(string entityName)
     {
         if (!Entities.TryGetValue(entityName, out Entity? entityConfig))
@@ -580,22 +572,12 @@ public virtual EntityCacheLevel GetEntityCacheEntryLevel(string entityName)
                 subStatusCode: DataApiBuilderException.SubStatusCodes.EntityNotFound);
         }
 
-        if (!entityConfig.IsCachingEnabled)
-        {
-            throw new DataApiBuilderException(
-                message: $"{entityName} does not have caching enabled.",
-                statusCode: HttpStatusCode.BadRequest,
-                subStatusCode: DataApiBuilderException.SubStatusCodes.NotSupported);
-        }
-
-        if (entityConfig.Cache.UserProvidedLevelOptions)
+        if (entityConfig.Cache is not null && entityConfig.Cache.UserProvidedLevelOptions)
         {
             return entityConfig.Cache.Level.Value;
         }
-        else
-        {
-            return EntityCacheLevel.L1L2;
-        }
+
+        return EntityCacheOptions.DEFAULT_LEVEL;
     }
 
     /// <summary>

src/Service.Tests/Caching/CachingConfigProcessingTests.cs

@@ -416,4 +416,48 @@ private static string GetRawConfigJson(string globalCacheConfig, string entityCa
 
         return expectedRuntimeConfigJson.ToString();
     }
+
+    /// <summary>
+    /// Regression test: Validates that when global runtime cache is enabled but entity cache is disabled,
+    /// GetEntityCacheEntryTtl and GetEntityCacheEntryLevel do not throw and return sensible defaults.
+    /// Previously, these methods threw a DataApiBuilderException (BadRequest/NotSupported) when the entity
+    /// had caching disabled, which caused 400 errors for valid requests when the global cache was enabled.
+    /// These methods are now pure accessors that always return a value regardless of cache enablement.
+    /// </summary>
+    /// <param name="globalCacheConfig">Global cache configuration JSON fragment.</param>
+    /// <param name="entityCacheConfig">Entity cache configuration JSON fragment.</param>
+    /// <param name="expectedTtl">Expected TTL returned by GetEntityCacheEntryTtl.</param>
+    /// <param name="expectedLevel">Expected cache level returned by GetEntityCacheEntryLevel.</param>
+    [DataRow(@",""cache"": { ""enabled"": true, ""ttl-seconds"": 10 }", @",""cache"": { ""enabled"": false }", 10, EntityCacheLevel.L1L2, DisplayName = "Global cache enabled with custom TTL, entity cache disabled: entity returns global TTL and default level.")]
+    [DataRow(@",""cache"": { ""enabled"": true }", @",""cache"": { ""enabled"": false }", 5, EntityCacheLevel.L1L2, DisplayName = "Global cache enabled with default TTL, entity cache disabled: entity returns default TTL and default level.")]
+    [DataRow(@",""cache"": { ""enabled"": true, ""ttl-seconds"": 10 }", @"", 10, EntityCacheLevel.L1L2, DisplayName = "Global cache enabled with custom TTL, entity cache omitted: entity returns global TTL and default level.")]
+    [DataTestMethod]
+    public void GetEntityCacheEntryTtlAndLevel_DoesNotThrow_WhenRuntimeCacheEnabledAndEntityCacheDisabled(
+        string globalCacheConfig,
+        string entityCacheConfig,
+        int expectedTtl,
+        EntityCacheLevel expectedLevel)
+    {
+        // Arrange
+        string fullConfig = GetRawConfigJson(globalCacheConfig: globalCacheConfig, entityCacheConfig: entityCacheConfig);
+        RuntimeConfigLoader.TryParseConfig(
+            json: fullConfig,
+            out RuntimeConfig? config,
+            replacementSettings: null);
+
+        Assert.IsNotNull(config, message: "Config must not be null, runtime config JSON deserialization failed.");
+        Assert.IsTrue(config.IsCachingEnabled, message: "Global caching should be enabled for this test scenario.");
+
+        Entity entity = config.Entities.First().Value;
+        Assert.IsFalse(entity.IsCachingEnabled, message: "Entity caching should be disabled for this test scenario.");
+
+        string entityName = config.Entities.First().Key;
+
+        // Act & Assert - These calls must not throw.
+        int actualTtl = config.GetEntityCacheEntryTtl(entityName);
+        EntityCacheLevel actualLevel = config.GetEntityCacheEntryLevel(entityName);
+
+        Assert.AreEqual(expected: expectedTtl, actual: actualTtl, message: "GetEntityCacheEntryTtl should return the global/default TTL when entity cache is disabled.");
+        Assert.AreEqual(expected: expectedLevel, actual: actualLevel, message: "GetEntityCacheEntryLevel should return the default level when entity cache is disabled.");
+    }
 }

src/Service.Tests/Configuration/ConfigurationTests.cs

@@ -2903,7 +2903,7 @@ public async Task ValidateErrorMessageForMutationWithoutReadPermission()
                         }";
                     string queryName = "stock_by_pk";
 
-                    ValidateMutationSucceededAtDbLayer(server, client, graphQLQuery, queryName, authToken, AuthorizationResolver.ROLE_AUTHENTICATED);
+                    await ValidateMutationSucceededAtDbLayer(server, client, graphQLQuery, queryName, authToken, AuthorizationResolver.ROLE_AUTHENTICATED);
                 }
                 finally
                 {
@@ -3225,7 +3225,7 @@ public async Task ValidateInheritanceOfReadPermissionFromAnonymous()
         /// <param name="query">GraphQL query/mutation text</param>
         /// <param name="queryName">GraphQL query/mutation name</param>
         /// <param name="authToken">Auth token for the graphQL request</param>
-        private static async void ValidateMutationSucceededAtDbLayer(TestServer server, HttpClient client, string query, string queryName, string authToken, string clientRoleHeader)
+        private static async Task ValidateMutationSucceededAtDbLayer(TestServer server, HttpClient client, string query, string queryName, string authToken, string clientRoleHeader)
         {
             JsonElement queryResponse = await GraphQLRequestExecutor.PostGraphQLRequestAsync(
                                                 client,
@@ -3237,6 +3237,7 @@ private static async void ValidateMutationSucceededAtDbLayer(TestServer server,
                                                 clientRoleHeader: clientRoleHeader);
 
             Assert.IsNotNull(queryResponse);
+            Assert.AreNotEqual(JsonValueKind.Null, queryResponse.ValueKind, "Expected a JSON object response but received null.");
             Assert.IsFalse(queryResponse.TryGetProperty("errors", out _));
         }