Rails 4，嵌套属性，对于ID =的人找不到ID =的标签

Question

Rails 4：我想用标签创建Person

person = Person.new(:name=>Jon', :tags_attributes=>[{:id=>'15', :name=>'some_tag'}])

我的人模型：

class Person < ActiveRecord::Base

  validates :name, presence: true

  belongs_to :user
  has_many :organizations, through: :people_organizations
  has_and_belongs_to_many :tags, join_table: :people_tags

  has_many :phones, as: :phoneable, :dependent => :destroy
  has_many :emails, as: :emaileable, :dependent => :destroy
  has_many :networks, as: :networkable, :dependent => :destroy
  has_many :messengers, as: :messengerable, :dependent => :destroy

  accepts_nested_attributes_for :phones, :emails, :networks, :messengers, allow_destroy: true
  accepts_nested_attributes_for :tags, reject_if: :all_blank

end

我的PeopleController：

  def create
    @person = Person.new(person_params)

    respond_to do |format|
      if @person.save(validate: false)
        format.json { render action: 'show', status: :created }
      else
        format.json { render json: @person.errors, status: :unprocessable_entity }
      end
    end
  end

  def person_params
    params.require(:person).permit(:id, :name, :born, :description, 
      phones_attributes:[:id, :number, :_destroy],
      emails_attributes:[:id, :email, :_destroy]
      networks_attributes:[:id, :name, :_destroy],
      messengers_attributes:[:id, :identifier, :_destroy],
      tags_attributes:[:id, :name, :_destroy]
    )
  end

创建新人时出现错误

p = Person.new(:name=>'Jon', :tags_attributes=>[{:id=>'15', :name=>'tag'}])

找不到ID = 15的人的ID = 15的标签

请告诉我该怎么做才能保留模型

Answer 1

我遇到了同样的问题。我认为 Rails 不支持使用现有的嵌套记录创建新记录。我根本没有找到针对这种情况的解决方案。因此，尝试从 person_params 中过滤 Tags_attributes，然后使用 tag_ids，如下所示：

tag_ids = params[:person][:tags_attributes].map { |tag| tag[:id] }
@person = Person.new(person_params.merge({ tag_ids: tag_ids })