Rails - 在 Cocoon 中使用嵌套表单时未保存参数

Question

我已按照 Cocoon 的说明为 has_many 关联创建嵌套表单，但有一件事我似乎无法弄清楚。我可以将现有流派添加到我的项目中，但是在创建全新的流派时，我的流派的参数是不允许的。当我参考我的 Rails 控制台来调试问题时，这是我在更新时收到的消息：

Unpermitted parameters: genre_attributes

奇怪的是我已经允许我的连接表genreships 和我的genre 模型以及我的movie 模型接受它们的嵌套属性但仍然没有运气。在我的movie_params 方法中必须有一些我没有做但无法找到的东西。我确实试图在此方法中允许所有可能的属性，并且完全不知道可能是什么解决方案

模型

class Movie < ActiveRecord::Base
    has_many :genreships
    has_many :genres, through: :genreships

    accepts_nested_attributes_for :genres, :reject_if => :all_blank, :allow_destroy => true
    accepts_nested_attributes_for :genreships, :reject_if => :all_blank, :allow_destroy => true

    extend FriendlyId
    friendly_id :title, use: :slugged
end

class Genreship < ActiveRecord::Base
    belongs_to :movie
    belongs_to :genre

    accepts_nested_attributes_for :genre, :reject_if => :all_blank
end

class Genre < ActiveRecord::Base
    has_many :genreships
    has_many :movies, through: :genreships

    extend FriendlyId
    friendly_id :name, use: :slugged
end

电影控制器

def movie_params
  params.require(:movie).permit(:title, :release_date, :summary, genreships_attributes: [:id, :genre_id, :_destroy], genres_attributes: [:id, :_destroy, :name])
end

表格

= simple_form_for @movie do |f|

  .field
    = f.input :title
  .field
    = f.input :release_date, label: 'Release Date', order: [:month, :day, :year], start_year: 1901
  .field
    = f.input :summary, as: :text
  #genres
    = f.simple_fields_for :genreships do |genreship|
      = render 'genreship_fields', :f => genreship
    = link_to_add_association 'add a genre', f, :genreships
  .actions = f.submit 'Save', class: 'btn btn-default'

类型部分

.nested-fields
  #genre_from_list
    = f.association :genre, :collection => Genre.order(:name), :prompt => 'Choose an existing genre'
  = link_to_add_association 'or create a new genre', f, :genre
  = link_to_remove_association "remove genre", f

类型部分

.nested-fields
  = f.input :name

以下是发布新电影后 Rails 控制台中显示的内容：

Started POST "/movies" for 127.0.0.1 at 2014-11-19 08:17:42 -0500

Processing by MoviesController#create as HTML
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"2/wqXhn/x73AdOOrSo49Q/OPAmrcVk0rLViJJNpIhps=", "movie"=>{"title"=>"", "release_date(2i)"=>"11", "release_date(3i)"=>"19", "release_date(1i)"=>"2014", "summary"=>"", "genreships_attributes"=>{"1416403056574"=>{"genre_attributes"=>{"name"=>"Comedy"}, "genre_id"=>"", "_destroy"=>"false"}}}, "commit"=>"Save"}
Unpermitted parameters: genre_attributes

Answer 1

您使用genre_attributes 而genres_attributes（复数形式）在您的控制器中定义。将其更改为：

def movie_params
  params.require(:movie).permit(:title, :release_date, :summary, genreships_attributes: [:id, :genre_id, :_destroy], genre_attributes: [:id, :_destroy, :name])
end

Answer 2

我创建的解决方案在某种意义上与 Nathan 的示例代码有所不同，但仍然可以完成工作。只需将这条线从 genreship_fields.html.slim 移动到 _form.html.slim 就可以了：

link_to_add_association 'create a new genre', f, :genres

我的部分现在看起来像这样：

表格

= simple_form_for @movie do |f|
  .field
    = f.input :title
  .field
    = f.input :release_date, label: 'Release Date', order: [:month, :day, :year], start_year: 1901
  .field
    = f.input :summary, as: :text
  #genres
    = f.simple_fields_for :genreships do |genreship|
      = render 'genreship_fields', :f => genreship
    | #{link_to_add_association 'add a genre', f, :genreships} | #{link_to_add_association 'create a new genre', f, :genres}
  .actions = f.submit 'Save', class: 'btn btn-default'

类型部分

.nested-fields
  #genre_from_list
    = f.association :genre, :collection => Genre.order(:name), :prompt => 'Choose an existing genre'
  = link_to_remove_association "remove genre", f

类型部分

.nested-fields
  = f.input :name
  = link_to_remove_association "remove form", f