module ActiveRecord::AttributeMethods::PrimaryKey

id ()

Returns the primary key column’s value. If the primary key is composite, returns an array of the primary key column values.

# File activerecord/lib/active_record/attribute_methods/primary_key.rb, line 20
def id
  return _read_attribute(@primary_key) unless @primary_key.is_a?(Array)

  @primary_key.map { |pk| _read_attribute(pk) }
end

id= (value)

Sets the primary key column’s value. If the primary key is composite, raises TypeError when the set value not enumerable.

# File activerecord/lib/active_record/attribute_methods/primary_key.rb, line 34
def id=(value)
  if self.class.composite_primary_key?
    raise TypeError, "Expected value matching #{self.class.primary_key.inspect}, got #{value.inspect}." unless value.is_a?(Enumerable)
    @primary_key.zip(value) { |attr, value| _write_attribute(attr, value) }
  else
    _write_attribute(@primary_key, value)
  end
end

id? ()

Queries the primary key column’s value. If the primary key is composite, all primary key column values must be queryable.

# File activerecord/lib/active_record/attribute_methods/primary_key.rb, line 45
def id?
  if self.class.composite_primary_key?
    @primary_key.all? { |col| _query_attribute(col) }
  else
    _query_attribute(@primary_key)
  end
end

id_before_type_cast ()

Returns the primary key column’s value before type cast. If the primary key is composite, returns an array of primary key column values before type cast.

# File activerecord/lib/active_record/attribute_methods/primary_key.rb, line 55
def id_before_type_cast
  if self.class.composite_primary_key?
    @primary_key.map { |col| attribute_before_type_cast(col) }
  else
    attribute_before_type_cast(@primary_key)
  end
end

id_in_database ()

Returns the primary key column’s value from the database. If the primary key is composite, returns an array of primary key column values from database.

# File activerecord/lib/active_record/attribute_methods/primary_key.rb, line 75
def id_in_database
  if self.class.composite_primary_key?
    @primary_key.map { |col| attribute_in_database(col) }
  else
    attribute_in_database(@primary_key)
  end
end

id_was ()

Returns the primary key column’s previous value. If the primary key is composite, returns an array of primary key column previous values.

# File activerecord/lib/active_record/attribute_methods/primary_key.rb, line 65
def id_was
  if self.class.composite_primary_key?
    @primary_key.map { |col| attribute_was(col) }
  else
    attribute_was(@primary_key)
  end
end

to_key ()

Returns this record’s primary key value wrapped in an array if one is available.

# File activerecord/lib/active_record/attribute_methods/primary_key.rb, line 13
def to_key
  key = id
  Array(key) if key
end

module ActiveRecord::AttributeMethods::PrimaryKey

Active Record Attribute Methods Primary Key¶ ↑

Public Instance Methods