module ActiveRecord class TableMetadata # :nodoc: delegate :foreign_type, :foreign_key, to: :association, prefix: true delegate :association_primary_key, to: :association def initialize(klass, arel_table, association = nil) @klass = klass @arel_table = arel_table @association = association end def resolve_column_aliases(hash) # This method is a hot spot, so for now, use Hash[] to dup the hash. # https://bugs.ruby-lang.org/issues/7166 new_hash = Hash[hash] hash.each do |key, _| if (key.is_a?(Symbol)) && klass.attribute_alias?(key) new_hash[klass.attribute_alias(key)] = new_hash.delete(key) end end new_hash end def arel_attribute(column_name) if klass klass.arel_attribute(column_name, arel_table) else arel_table[column_name] end end def type(column_name) if klass klass.type_for_attribute(column_name.to_s) else Type::Value.new 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.alias(table_name) else type_caster = TypeCaster::Connection.new(klass, 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