Module: DeclareSchema::Model

Defined in:
lib/declare_schema/model.rb,
lib/declare_schema/model/field_spec.rb,
lib/declare_schema/model/index_definition.rb,
lib/declare_schema/model/foreign_key_definition.rb,
lib/declare_schema/model/table_options_definition.rb

Defined Under Namespace

Modules: ClassMethods Classes: FieldSpec, ForeignKeyDefinition, IndexDefinition, TableOptionsDefinition

Class Method Summary collapse

Class Method Details

.mix_in(base) ⇒ Object 



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# File 'lib/declare_schema/model.rb', line 8

def mix_in(base)
  base.singleton_class.prepend ClassMethods unless base.singleton_class < ClassMethods # don't mix in if a base class already did it

  base.class_eval do
    # ignore the model in the migration until somebody sets
    # @include_in_migration via the fields declaration
    inheriting_cattr_reader include_in_migration: false

    # attr_types holds the type class for any attribute reader (i.e. getter
    # method) that returns rich-types
    inheriting_cattr_reader attr_types: HashWithIndifferentAccess.new
    inheriting_cattr_reader attr_order: []

    # field_specs holds FieldSpec objects for every declared
    # field. Note that attribute readers are created (by ActiveRecord)
    # for all fields, so there is also an entry for the field in
    # attr_types. This is redundant but simplifies the implementation
    # and speeds things up a little.
    inheriting_cattr_reader field_specs: HashWithIndifferentAccess.new

    # index_definitions holds IndexDefinition objects for all the declared indexes.
    inheriting_cattr_reader index_definitions: []
    inheriting_cattr_reader ignore_indexes: []
    inheriting_cattr_reader constraint_specs: []

    # table_options holds optional configuration for the create_table statement
    # supported options include :charset and :collation
    inheriting_cattr_reader table_options: HashWithIndifferentAccess.new

    # eval avoids the ruby 1.9.2 "super from singleton method ..." error

    eval %(
      def self.inherited(klass)
        unless klass.field_specs.has_key?(inheritance_column)
          fields do |f|
            f.field(inheritance_column, :string, limit: 255, null: true)
          end
          index(inheritance_column)
        end
        super
      end
    )
  end
end