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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]
else
# FIXME: We really shouldn't need to do this.
ConnectionAdapters::Column.new(column_name.to_s, nil, 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
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
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