fix(tool): added a check to see if a generic type was already generated

Author: pablor21

generator/generator.go

@@ -1866,6 +1866,21 @@ func (g *Generator) generateConcreteTypesFromInstantiations() error {
 	slog.Info("Generating concrete types from instantiations", "count", len(g.GenericInstantiations))
 
 	for concreteTypeName, inst := range g.GenericInstantiations {
+		// Skip if this type was already generated (e.g., explicitly annotated struct)
+		alreadyGenerated := false
+		for _, item := range g.GeneratedItems {
+			if item.GQLName == concreteTypeName {
+				slog.Debug("Skipping concrete type generation - already generated",
+					"concreteType", concreteTypeName,
+					"existingType", item.GoTypeName)
+				alreadyGenerated = true
+				break
+			}
+		}
+		if alreadyGenerated {
+			continue
+		}
+
 		slog.Debug("Processing concrete type",
 			"concreteTypeName", concreteTypeName,
 			"genericType", inst.GenericTypeName)

gqlschemagen.yml

@@ -52,8 +52,9 @@ output_file_extension: .graphqls
 field_case: camel
 
 # Use json struct tags for field names when gql tag is not present
+# This will follow the ignore rules of the json package (e.g., json:"-" to ignore fields)
 # Default: true
-use_json_tag: true
+use_json_tag: true 
 
 # Generate gqlgen directives (@goModel, @goField, @goTag)
 # Default: false