module ActiveRecord class TableMetadata # :nodoc: delegate :foreign_type, :foreign_key, to: :association, prefix: true def initialize(klass, arel_table, association = nil) @klass = klass @arel_table = arel_table @association = association end def resolve_column_aliases(hash) hash = hash.dup hash.keys.grep(Symbol) do |key| if klass.attribute_alias? key hash[klass.attribute_alias(key)] = hash.delete key end end hash end def arel_attribute(column_name) arel_table[column_name] end def column(column_name) if klass klass.columns_hash[column_name.to_s] end end def associated_with?(association_name) klass && klass._reflect_on_association(association_name) end def associated_table(table_name) return self if table_name == arel_table.name association = klass._reflect_on_association(table_name) if association && !association.polymorphic? association_klass = association.klass arel_table = association_klass.arel_table else type_caster = TypeCaster::Connection.new(klass.connection, table_name) association_klass = nil arel_table = Arel::Table.new(table_name, type_caster: type_caster) end TableMetadata.new(association_klass, arel_table, association) end def polymorphic_association? association && association.polymorphic? end protected attr_reader :klass, :arel_table, :association end end