Improved error message when ProjectTo is selected as the query strategy with an unsupporting provider (mapperly)

Author: jp-seini

Modules/Intent.Modules.Application.DomainInteractions/Intent.Application.DomainInteractions.imodspec

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <package>
   <id>Intent.Application.DomainInteractions</id>
-  <version>1.1.5</version>
+  <version>1.1.6-pre.0</version>
   <supportedClientVersions>[4.5.15-a,5.0.0)</supportedClientVersions>
   <summary>Provides interaction strategies to generate domain interaction implementations.</summary>
   <description>Provides interaction strategies to generate domain interaction implementations.</description>

Modules/Intent.Modules.Application.DomainInteractions/Intent.Modules.Application.DomainInteractions.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <TargetFramework>net8.0</TargetFramework>
-    <Version>1.1.5</Version>
+    <Version>1.1.6-pre.0</Version>
     <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
     <Nullable>enable</Nullable>
   </PropertyGroup>

Modules/Intent.Modules.Application.DomainInteractions/QueryActionContext.cs

@@ -1,11 +1,12 @@
-using System;
-using System.Linq;
-using Intent.Exceptions;
+using Intent.Exceptions;
 using Intent.Metadata.Models;
 using Intent.Modelers.Domain.Api;
 using Intent.Modelers.Services.Api;
+using Intent.Modules.Application.DomainInteractions.Strategies;
 using Intent.Modules.Common.CSharp.Builder;
 using Intent.Modules.Common.CSharp.Templates;
+using System;
+using System.Linq;
 using OperationModelExtensions = Intent.Modelers.Domain.Api.OperationModelExtensions;
 
 namespace Intent.Modules.Application.DomainInteractions
@@ -34,6 +35,11 @@ public QueryActionContext(ICSharpClassMethodDeclaration method, ActionType actio
                 IsPaginated = true;
                 ReturnType = _serviceEndPoint.TypeReference!.GenericTypeParameters.FirstOrDefault()?.Element as IElement;
             }
+            var mapper = MappingStrategyProvider.Instance.GetMappingStrategy(method);
+            if (!mapper?.HasProjectTo() ?? true)
+            {
+                throw new ElementException(AssociationEnd, "'ProjectTo' functionality is unavailable with the current mapping provider. Use a supporting module (e.g., Intent.Application.AutoMapper), or change the application setting \"Default Query Implementation\" from 'ProjectTo' to 'Default'.");
+            }
             if (IsConfiguredForProjections())
             {
                 //We're doing this because the CRUD modules are generally compatible with AutoMapper module v4 this Feature requires V5.

Modules/Intent.Modules.Application.DomainInteractions/Strategies/IMappingStrategy.cs

@@ -12,6 +12,7 @@ namespace Intent.Modules.Application.DomainInteractions.Strategies
 {
     public interface IMappingStrategy
     {
+        bool HasProjectTo();
         bool IsMatch(ICSharpClassMethodDeclaration method);
 
         void ImplementMappingStatement(ICSharpClassMethodDeclaration method, List<CSharpStatement> statements,
@@ -44,6 +45,8 @@ public void ImplementPagedMappingStatement(ICSharpClassMethodDeclaration method,
             var autoMapperFieldName = method.Class.InjectService(template.UseType("AutoMapper.IMapper"));
             statements.Add($"return {entity.VariableName}.{mappingMethod}(x => x.MapTo{returnDto}({autoMapperFieldName}));");
         }
+
+        public bool HasProjectTo() => true;
     }
 
     public class MapperlyMappingStrategy : IMappingStrategy
@@ -71,5 +74,7 @@ public void ImplementPagedMappingStatement(ICSharpClassMethodDeclaration method,
             return;
             throw new NotImplementedException();
         }
+
+        public bool HasProjectTo() => false;
     }
 }

Modules/Intent.Modules.Application.DomainInteractions/release-notes.md

@@ -1,3 +1,7 @@
+### Version 1.1.6
+
+- Improvement: Improved error message when `ProjectTo` is selected as the query strategy with an unsupporting provider (mapperly)
+
 ### Version 1.1.5
 
 - Improvement: Support for Mapperly module