Question

我无法正确使用 - 我的应用程序中有多态协议且工作正常 - 我可以通过rails控制台为电影或导演添加注释而不会出现问题。但使用表单我得到错误“未初始化的常量评论::评论”。控制器和型号：

class CommentsController < ApplicationController
    before_action :find_comment, only: [:edit, :update, :destroy]
    before_action :logged_user

    def new
        if params[:movie_id]
            @movie = Movie.find(params[:movie_id])
        else
            @director = Director.find(params[:director_id])
        end
        @comment = Comment.new
    end

    def create
        if params[:movie_id]
            @commentable = Movie.find(params[:movie_id])
        else
            @commentable = Director.find(params[:director_id])
        end
        @comment = @commentable.comments.new(comment_params)
        @comment.user = current_user
        if @comment.save
            flash[:success] = 'Dodano komentarz.'
            redirect_to @commentable
        else
            flash[:danger] = 'Coś poszło nie tak, spróbuj ponownie.'
            render :new
        end
    end

    private
    def comment_params
        params.require(:comment).permit(:content, :grade)
    end

    def find_comment
        @comment = Comment.find(params[:id])
    end

end

class Movie < ActiveRecord::Base

    belongs_to :director
    has_many :comments, as: :commentable, dependent: :destroy
    has_many :users, through: :comments, source: :commentable, source_type: "User"
    accepts_nested_attributes_for :comments, :allow_destroy => true
end

class User < ActiveRecord::Base

    has_many :comments, dependent: :destroy
    has_many :movies, through: :comments, source: :commentable, source_type: "Movie"
    has_many :directors, through: :comments, source: :commentable, source_type: "Director"
    accepts_nested_attributes_for :comments, :allow_destroy => true
end

class Comment < ActiveRecord::Base
    belongs_to :commentable, polymorphic: true
    belongs_to :user

    validates_uniqueness_of :commentable, scope: :user
    validates :content, presence: true, length: { minimum: 40 }

end

我稍后会清理控制器，现在我只是想让它工作。请求中传递的参数：

{"utf8"=>"✓",
 "authenticity_token"=>"l+uouiN7H6hHArtiHGSw4MCsA8d37b60oDgNfskrTpwlDmJigLfBuMzYbA37mweInZEniVjzAzoPKB0dBRvJAA==",
 "comment"=>{"grade"=>"1",
 "content"=>"Lorem ipsum dolor sit amet enim. Etiam ullamcorper. Suspendisse a pellentesque dui,
 non felis. Maecenas malesuada elit lectus felis,
 malesuada ultricies. Curabitur et ligula. Ut molestie a,
 ultricies porta urna. Vestibulum commodo volutpat a,
 convallis ac,
 laoreet enim. Phasellus fermentum in,
 dolor. Pellentesque facilisis. Nulla imperdiet sit amet magna. Vestibulum dapibus,
 mauris nec malesuada fames ac turpis velit,
 rhoncus eu,
 luctus"},
 "commit"=>"Zapisz",
 "movie_id"=>"46"}

我不知道为什么，但是user_id没有在请求中传递。你能帮我么？我很感激任何帮助！

编辑：评论表：

<%= render 'shared/errors', obj: @comment %>    
<div class="row">
    <div class="col-md-8 col-md-offset-2 well">
        <%= form_for @comment, url: new_or_edit do |f| %>

            <%= f.label 'Ocena' %>
            <%= f.select :grade, options_for_select(1..10) %>

            <%= f.label 'Komentarz' %>
            <%= f.text_area :content, rows: 5 %>

            <%= f.submit 'Zapisz', class: 'btn btn-success' %>
            <%= link_to 'Powrót', :back, class: 'btn btn-default uneditable-input' %>
        <% end %>
    </div>
</div>

架构：

  create_table "comments", force: :cascade do |t|
    t.string   "content"
    t.integer  "grade"
    t.datetime "created_at"
    t.datetime "updated_at"
    t.integer  "commentable_id"
    t.string   "commentable_type"
    t.integer  "user_id"
  end

Answer 1

好的确有效。问题是行

validates_uniqueness_of :commentable, scope: :user

将其更改为：

后，它正常工作

validates :user, uniqueness: { scope: [ :commentable_type, :commentable_id ] }

多态关联 - 控制器创建错误

1 个答案: