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方法
A

執行個體公共方法

assign_attributes(new_attributes)

您可以透過傳遞包含與屬性名稱相符的金鑰的屬性雜湊來設定所有屬性。

如果傳遞的雜湊會回應 permitted? 方法，且此方法傳回的值為 false，則會引發 ActiveModel::ForbiddenAttributesError 例外。「

class Cat
  include ActiveModel::AttributeAssignment
  attr_accessor :name, :status
end

cat = Cat.new
cat.assign_attributes(name: "Gorby", status: "yawning")
cat.name # => 'Gorby'
cat.status # => 'yawning'
cat.assign_attributes(status: "sleeping")
cat.name # => 'Gorby'
cat.status # => 'sleeping'
別名如下： attributes=

來源： 顯示 | 在 GitHub 上

# File activemodel/lib/active_model/attribute_assignment.rb, line 28
def assign_attributes(new_attributes)
  unless new_attributes.respond_to?(:each_pair)
    raise ArgumentError, "When assigning attributes, you must pass a hash as an argument, #{new_attributes.class} passed."
  end
  return if new_attributes.empty?

  _assign_attributes(sanitize_for_mass_assignment(new_attributes))
end

attribute_writer_missing(name, value)

例如「BasicObject#method_missing」，當「#assign_attributes」傳遞未知屬性名稱時，會呼叫「#attribute_writer_missing」。

預設「#attribute_writer_missing」會引發 UnknownAttributeError。

class Rectangle
  include ActiveModel::AttributeAssignment

  attr_accessor :length, :width

  def attribute_writer_missing(name, value)
    Rails.logger.warn "Tried to assign to unknown attribute #{name}"
  end
end

rectangle = Rectangle.new
rectangle.assign_attributes(height: 10) # => Logs "Tried to assign to unknown attribute 'height'"

來源： 顯示 | 在 GitHub 上

# File activemodel/lib/active_model/attribute_assignment.rb, line 56
def attribute_writer_missing(name, value)
  raise UnknownAttributeError.new(self, name)
end

attributes=(new_attributes)

別名為： assign_attributes