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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
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