Rails簡單像按鈕與ajax jquery

Question

我即將建立一個類似的機器爲我的食譜類。

class LikesController 
    def update 
    @like = Like.find(params[:id]) 
    end 

    def destroy 
    @like = Like.find(params[:id]) 
    @recipe = Recipe.find(params[:id]) 
    @like.destroy 
    end 
end 

def show 
    @recipe = Recipe.find(params[:id]) 
end 

食譜/ show.html.erb

<div id="like_form"> 
    <% if like = current_user.likes.find_by_recipe_id(@recipe.id) %> 
    <%= form_for like, :html => { :method => :delete },:remote => true do |f| %> 
     <%= f.submit "Unlike" %> 
    <% end %> 
    <% else %> 
    <%= form_for current_user.likes.create(:recipe_id => @recipe.id), :remote => true do |f| %> 
     <%= f.hidden_field :recipe_id %> 
     <%= f.hidden_field :user_id %> 
     <%= f.submit "Like" %> 
    <% end %> 
    <% end %> 

喜歡/ destroy.js.erb

$("#like_form").html("<%= escape_javascript(render('recipes/like')) %>") 

喜歡/ update.js.erb

$("#like_form").html("<%= escape_javascript(render('recipes/unlike')) %>") 

食譜/_unlike.html.erb

個

<%= form_for @like, :html => { :method => :delete }, 
       :remote => true do |f| %> 
    <%= f.submit "Unlike" %> 
<% end %> 

食譜/ _like.html.erb

<%= form_for current_user.likes.create(:recipe_id => @recipe.id), :remote => true do |f| %> 
    <%= f.hidden_field :recipe_id %> 
    <%= f.hidden_field :user_id %> 
    <%= f.submit "Like" %> 
<% end %> 

點擊 「不像」， 「贊」 按鈕應該被渲染後。但我不知道如何在_like.html部分中創建form_for參數。

我不知道如何獲取recipe.id的值。如何使_like.html.erb中的recipe.id可用？

ActionView::Template::Error (undefined method `id' for nil:NilClass):1: 
<%= form_for current_user.likes.create(:recipe_id => @recipe.id), 
           :remote => true do |f| %> 
2: <%= f.hidden_field :recipe_id %> 
3: <%= f.hidden_field :user_id %> 
4: <%= f.submit "Like" %> 
    app/views/recipes/_like.html.erb:1:in 
    _app_views_recipes__like_html_erb___1003281063_65806008' 
    app/views/likes/destroy.js.erb:1:in 
    _app_views_likes_destroy_js_erb___41116873_65874912' 

Answer 1

與固定它：

_like.html.erb

<% if like = current_user.likes.find_by_recipe_id(@recipe.id) %> 
    <% else %> 
    <%= form_for current_user.likes.build(:recipe_id => @recipe.id), :remote => true do |f| %> 
    <%= f.hidden_field :recipe_id %> 
    <%= f.hidden_field :user_id %> 
    <%= f.submit "Like" %> 
    <% end %> 
<% end %>