Question

我有一个用户和指南模型。

我希望用户能够将指南标记为他们的最爱，然后查看所有他们喜爱的指南列表。

这不太对劲。我不确定'最喜欢'的动作是否正确添加了一个喜欢的;或者如果添加正确，它在收藏夹视图中无法正确显示（因此'show'操作可能不正确）...

* CONTROLLER * guidelines_controller.rb

def favourite
   type = params[:type]
   if type == "favourite"
    @guideline= Guideline.find_all_by_id(params[:guideline_id])
    current_user.favourite_guidelines << @guideline
     redirect_to :back, notice: 'You favourited #{@guideline.name}'
    elsif type == "unfavourite"
     current_user.favourite_guidelines.delete(@guideline)
     redirect_to :back, notice: 'Unfavourited #{@guideline.name}'

    else
    # Type missing, nothing happens
   redirect_to :back, notice: 'Nothing happened.'
    end
  end

* CONTROLLER * favourites_controller.rb

 def show

    @user = User.find_by_profile_name(params[:id])
    if @user 
        @guidelines = @user.favourite_guidelines.all
        render action: :show
    else
        render file: 'public/404', status: 404, formats: [:html]
    end
  end
end

* 路线 * routes.rb中

get "guidelines/favourite"
  get "favourites/show"

* MODEL * user.rb

has_many :guidelines
 has_many :favourite_guidelines

* MODEL * favourite_guidelines.rb

  attr_accessible :guideline_id, :user_id

  belongs_to :user

* 视图 *准则/ index.html.erb

<% if current_user %>
    <%= link_to "favourite",   guidelines_favourite_path(guideline, type: "favourite"), method: "get" %>
    <%= link_to "unfavourite", guidelines_favourite_path(guideline, type: "unfavourite"), method: "get" %>

* 视图 *收藏夹/ show.html.erb

<% if @guidelines %>
    <% @guidelines.each do |guideline| %>

        <div class="well">
            <%= link_to guideline.title, guideline %>
            <br />
            <%= guideline.content %>
            <br />
            Added <%=  time_ago_in_words(guideline.created_at) %> ago
        </div>
    <% end %>
<% end %>

Answer 1

根据您的评论，返回nil：

@guideline= Guideline.find_by_id(params[:guideline_id])  #=> nil
current_user.favourite_guidelines << nil #Gives association mismatch error

我认为params[:guideline_id]是nil。从日志文件中发布你的参数。

或试试这个：

将您的链接更改为：

<%= link_to "favourite",   guidelines_favourite_path(guideline_id: guideline.id, type: "favourite"), method: "get" %>
<%= link_to "unfavourite", guidelines_favourite_path(guideline_id: guideline.id, type: "unfavourite"), method: "get" %>

在您之前的案例中：

 @guideline= Guideline.find_all_by_id(params[:guideline_id]) #=> []
 current_user.favourite_guidelines << [] #=> Valid and inserting nothing

我的rails应用程序的收藏夹模型

1 个答案: