First working version of new GraphQL::TypeCreator after major refactoring

lib/graph_ql/type_creator.rb

@@ -0,0 +1,42 @@
+module GraphQL
+  class TypeCreator
+
+    # Return a GraphQL type for a 'database_type'
+    TYPES_CONVERSION = Hash.new(GraphQL::STRING_TYPE).merge(
+      integer: GraphQL::INT_TYPE,
+      boolean: GraphQL::BOOLEAN_TYPE,
+      float: GraphQL::FLOAT_TYPE,
+      double: GraphQL::FLOAT_TYPE
+    )
+
+    def self.create(model, field_names, api_types)
+
+      new_graphql_type = GraphQL::ObjectType.define do
+
+        name(model.name)
+        description("Generated programmatically from model: #{model.name}")
+
+        # Make a field for each column
+        field_names.each do |field_name|
+          if model.column_names.include?(field_name.to_s)
+            field(field_name.to_s, TYPES_CONVERSION[field_name])
+          else
+            association = model.reflect_on_all_associations.find { |a| a.name == field_name }
+            case association.macro
+            when :has_one
+              field(association.name, -> { api_types[association.klass] })
+            when :belongs_to
+              field(association.name, -> { api_types[association.klass] })
+            when :has_many
+              connection(association.name, api_types[association.klass].connection_type {
+                description "Description for a field with pagination"
+              })
+            end
+          end
+        end
+      end
+
+      return new_graphql_type
+    end
+  end
+end