fix accepts_nested_attributes_for is triggering db connection in rail…

…s 7.2. add single types/base.

lib/store_model/nested_attributes.rb

@@ -8,6 +8,11 @@ def self.included(base) # :nodoc:
     end
 
     module ClassMethods # :nodoc:
+      # gather storemodel attribute types on the class-level
+      def store_model_attribute_types
+        @store_model_attribute_types ||= {}
+      end
+
       # Enables handling of nested StoreModel::Model attributes
       #
       # @param associations [Array] list of associations and options to define attributes, for example:
@@ -38,8 +43,7 @@ def accepts_nested_attributes_for(*attributes)
         options = attributes.extract_options!
 
         attributes.each do |attribute|
-          case nested_attribute_type(attribute)
-          when Types::OneBase, Types::ManyBase
+          if nested_attribute_type(attribute).is_a?(Types::Base)
             options.reverse_merge!(allow_destroy: false, update_only: false)
             define_store_model_attr_accessors(attribute, options)
           else
@@ -50,17 +54,16 @@ def accepts_nested_attributes_for(*attributes)
 
       private
 
-      # If attribute defined in ActiveRecord model but you dont yet have database created
-      # you cannot access attribute types.
-      # To handle this case, we can use ActiveRecord::Attributes 'attributes_to_define_after_schema_loads'
-      # which stores information about custom defined attributes.
-      # See ActiveRecord::Attributes#atribute
-      # If #accepts_nested_attributes_for is used inside active model instance
-      # schema is not required to determine attribute type so we can still use attribute_types
-      # If schema loaded the attribute_types already populated and we can safely use it
-      # See ActiveRecord::ModelSchema#load_schema!
+      # when db connection is not available, it becomes impossible to read attributes types from
+      # ActiveModel::AttributeRegistration::ClassMethods.attribute_types, because activerecord
+      # overrides _default_attributes and triggers db connection.
+      # in order to avoid dirty hacks we say goodbye to rails attribute_types and rely on
+      # @store_model_attribute_types object, that we populate ourselves.
+      #
+      # @param attribute [String, Symbol]
+      # @return [StoreModel::Types::Base, nil]
       def nested_attribute_type(attribute)
-        attribute_types[attribute.to_s]
+        store_model_attribute_types[attribute.to_s]
       end
 
       def define_store_model_attr_accessors(attribute, options) # rubocop:disable Metrics/MethodLength
@@ -107,6 +110,15 @@ def define_association_setter_for_single(association, options)
           end
         end
       end
+
+      private
+
+      # marked in activemodel/attribute_registration as a method for modules to override
+      # add storemodel type of attribute if it is storemodel type
+      def hook_attribute_type(name, type)
+        store_model_attribute_types[name.to_s] = type if type.is_a?(Types::Base)
+        super
+      end
     end
 
     # Base

lib/store_model/types.rb

@@ -1,6 +1,7 @@
 # frozen_string_literal: true
 
 require "store_model/types/polymorphic_helper"
+require "store_model/types/base"
 
 require "store_model/types/one_base"
 require "store_model/types/one"

lib/store_model/types/base.rb

@@ -0,0 +1,25 @@
+# frozen_string_literal: true
+
+require "active_model"
+
+module StoreModel
+  module Types
+    # Base type for StoreModel::Model
+    class Base < ActiveModel::Type::Value
+      attr_reader :model_klass
+
+      # Returns type
+      #
+      # @return [Symbol]
+      def type
+        raise NotImplementedError
+      end
+
+      protected
+
+      def raise_cast_error(_value)
+        raise NotImplementedError
+      end
+    end
+  end
+end

lib/store_model/types/many_base.rb

@@ -4,18 +4,8 @@
 
 module StoreModel
   module Types
-    # Implements ActiveModel::Type::Value type for handling an array of
-    # StoreModel::Model
-    class ManyBase < ActiveModel::Type::Value
-      attr_reader :model_klass
-
-      # Returns type
-      #
-      # @return [Symbol]
-      def type
-        raise NotImplementedError
-      end
-
+    # Implements type for handling an array of StoreModel::Model
+    class ManyBase < Base
       # Casts +value+ from DB or user to StoreModel::Model instance
       #
       # @param value [Object] a value to cast
@@ -70,10 +60,6 @@ def cast_model_type_value(_value)
         raise NotImplementedError
       end
 
-      def raise_cast_error(_value)
-        raise NotImplementedError
-      end
-
       private
 
       # rubocop:disable Style/RescueModifier

lib/store_model/types/one_base.rb

@@ -4,17 +4,8 @@
 
 module StoreModel
   module Types
-    # Implements ActiveModel::Type::Value type for handling an instance of StoreModel::Model
-    class OneBase < ActiveModel::Type::Value
-      attr_reader :model_klass
-
-      # Returns type
-      #
-      # @return [Symbol]
-      def type
-        raise NotImplementedError
-      end
-
+    # Implements type for handling an instance of StoreModel::Model
+    class OneBase < Base
       # Casts +value+ from DB or user to StoreModel::Model instance
       #
       # @param value [Object] a value to cast
@@ -36,10 +27,6 @@ def changed_in_place?(raw_old_value, new_value)
 
       protected
 
-      def raise_cast_error(_value)
-        raise NotImplementedError
-      end
-
       def model_instance(_value)
         raise NotImplementedError
       end

spec/store_model/nested_attributes_spec.rb

@@ -535,7 +535,8 @@ def self.name
           end
         end
 
-        it { expect { subject }.to raise_error(ActiveRecord::StatementInvalid) }
+        it { expect { subject }.not_to(raise_error) }
+        it { expect(subject.instance_methods).to(include(:suppliers_attributes=)) }
       end
     end
   end