Cleanup

lib/datagrid/core.rb

@@ -9,13 +9,9 @@ def self.included(base)
       base.extend ClassMethods
       base.class_eval do
         class_attribute :scope_value
-
-        class_attribute :datagrid_attributes, instance_writer: false
-        self.datagrid_attributes = []
-
+        class_attribute :datagrid_attributes, instance_writer: false, default: []
         class_attribute :dynamic_block, instance_writer: false
-        class_attribute :forbidden_attributes_protection, instance_writer: false
-        self.forbidden_attributes_protection = false
+        class_attribute :forbidden_attributes_protection, instance_writer: false, default: false
         include ::ActiveModel::AttributeAssignment
       end
       base.include InstanceMethods
@@ -154,6 +150,11 @@ def attributes
 
       # Updates datagrid attributes with a passed hash argument
       # @param attributes [Hash<Symbol, Object>]
+      # @example
+      #   grid = MyGrid.new
+      #   grid.attributes = {first_name: 'John', last_name: 'Smith'}
+      #   grid.first_name # => 'John'
+      #   grid.last_name # => 'Smith'
       def attributes=(attributes)
         super(attributes)
       end

lib/datagrid/drivers/abstract_driver.rb

@@ -5,11 +5,10 @@ class AbstractDriver
 
       TIMESTAMP_CLASSES = [DateTime, Time, ActiveSupport::TimeWithZone]
 
-      class_attribute :subclasses
+      class_attribute :subclasses, default: []
 
       def self.inherited(base)
         super(base)
-        self.subclasses ||= []
         self.subclasses << base
       end
 

lib/datagrid/filters.rb

@@ -38,8 +38,7 @@ def self.included(base)
 
         include Datagrid::Core
         include Datagrid::Filters::CompositeFilters
-        class_attribute :filters_array
-        self.filters_array = []
+        class_attribute :filters_array, default: []
 
       end
       base.include InstanceMethods