Add own method

Add own method for getting `[JsonPropertyName]` instead of mingling with `[Display]`.

Author: martincostello

src/Validation/gen/Extensions/ISymbolExtensions.cs

@@ -19,7 +19,6 @@ attribute.AttributeClass is { } attributeClass &&
 
         if (displayNameAttribute is not null)
         {
-            // For the [Foo(Name = "bar")] case
             if (!displayNameAttribute.NamedArguments.IsDefaultOrEmpty)
             {
                 foreach (var namedArgument in displayNameAttribute.NamedArguments)
@@ -33,8 +32,20 @@ attribute.AttributeClass is { } attributeClass &&
                     }
                 }
             }
+        }
+
+        return null;
+    }
 
-            // For the [Foo("bar")] case
+    public static string? GetJsonPropertyName(this ISymbol property, INamedTypeSymbol jsonPropertyNameAttribute)
+    {
+        var displayNameAttribute = property.GetAttributes()
+            .FirstOrDefault(attribute =>
+                attribute.AttributeClass is { } attributeClass &&
+                SymbolEqualityComparer.Default.Equals(attributeClass, jsonPropertyNameAttribute));
+
+        if (displayNameAttribute is not null)
+        {
             if (displayNameAttribute.ConstructorArguments.Length is 1)
             {
                 var arg = displayNameAttribute.ConstructorArguments[0];

src/Validation/gen/Parsers/ValidationsGenerator.TypesParser.cs

@@ -196,9 +196,9 @@ internal ImmutableArray<ValidatableProperty> ExtractValidatableMembers(ITypeSymb
 
                         var displayName =
                             parameter.GetDisplayName(wellKnownTypes.Get(WellKnownTypeData.WellKnownType.System_ComponentModel_DataAnnotations_DisplayAttribute)) ??
-                            parameter.GetDisplayName(wellKnownTypes.Get(WellKnownTypeData.WellKnownType.System_Text_Json_Serialization_JsonPropertyNameAttribute)) ??
+                            parameter.GetJsonPropertyName(wellKnownTypes.Get(WellKnownTypeData.WellKnownType.System_Text_Json_Serialization_JsonPropertyNameAttribute)) ??
                             correspondingProperty.GetDisplayName(wellKnownTypes.Get(WellKnownTypeData.WellKnownType.System_ComponentModel_DataAnnotations_DisplayAttribute)) ??
-                            correspondingProperty.GetDisplayName(wellKnownTypes.Get(WellKnownTypeData.WellKnownType.System_Text_Json_Serialization_JsonPropertyNameAttribute)) ??
+                            correspondingProperty.GetJsonPropertyName(wellKnownTypes.Get(WellKnownTypeData.WellKnownType.System_Text_Json_Serialization_JsonPropertyNameAttribute)) ??
                             parameter.Name ??
                             correspondingProperty.Name;
 
@@ -260,7 +260,7 @@ internal ImmutableArray<ValidatableProperty> ExtractValidatableMembers(ITypeSymb
 
             var displayName =
                 member.GetDisplayName(wellKnownTypes.Get(WellKnownTypeData.WellKnownType.System_ComponentModel_DataAnnotations_DisplayAttribute)) ??
-                member.GetDisplayName(wellKnownTypes.Get(WellKnownTypeData.WellKnownType.System_Text_Json_Serialization_JsonPropertyNameAttribute)) ??
+                member.GetJsonPropertyName(wellKnownTypes.Get(WellKnownTypeData.WellKnownType.System_Text_Json_Serialization_JsonPropertyNameAttribute)) ??
                 member.Name;
 
             members.Add(new ValidatableProperty(