support Add a property name to exclude from mapping

Author: SimonCropp

src/GraphQL.EntityFramework/Mapping/Mapper.cs

@@ -3,6 +3,20 @@
 public static class Mapper<TDbContext>
     where TDbContext : DbContext
 {
+    static List<Func<string, bool>> ignoredNames = [];
+
+    /// <summary>
+    /// Add a property name to exclude from mapping.
+    /// </summary>
+    public static void AddIgnoredName(Func<string, bool> ignore) =>
+        ignoredNames.Add(ignore);
+
+    /// <summary>
+    /// Add a property name to exclude from mapping.
+    /// </summary>
+    public static void AddIgnoredName(string name) =>
+        ignoredNames.Add(_=> string.Equals(_, name, StringComparison.OrdinalIgnoreCase));
+
     static HashSet<Type> ignoredTypes = [];
 
     /// <summary>
@@ -177,6 +191,11 @@ static bool ShouldIgnore(IComplexGraphType graphType, string name, Type property
             }
         }
 
+        if (ignoredNames.Any(_ => _.Invoke(name)))
+        {
+            return true;
+        }
+
         if (FieldExists(graphType, name))
         {
             return true;

src/Tests/Mapping/MappingParent.cs

@@ -5,4 +5,5 @@ public class MappingParent
     public string? Property { get; set; }
     public IList<MappingChild> Children { get; set; } = [];
     public IList<string> JsonProperty { get; set; } = [];
+    public string? IgnoreByName { get; set; }
 }

src/Tests/Mapping/MappingTests.cs

@@ -4,7 +4,9 @@ public class MappingTests
 {
     static SqlInstance<MappingContext> sqlInstance;
 
-    static MappingTests() =>
+    static MappingTests()
+    {
+        Mapper<MappingContext>.AddIgnoredName("IgnoreByName");
         sqlInstance = new(builder =>
         {
             builder.ConfigureWarnings(_ =>
@@ -15,6 +17,7 @@ static MappingTests() =>
                     CoreEventId.CollectionWithoutComparer));
             return new(builder.Options);
         });
+    }
 
     [Fact]
     public async Task SchemaPrint()