Question

我即将为我的食谱类建立一个类似的机器。

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

配方/ 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 %>

喜欢/ destroy.js.erb

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

喜欢/ update.js.erb

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

配方/ _unlike.html.erb

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

配方/ _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 %>

点击“不喜欢”后，应该渲染“喜欢”按钮。但是我不知道如何在_like.html partial中创建form_for参数。

我不知道如何获取recipe.id的值。如何在_like.html.erb中使用recipe.id？

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

修复它：

_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 %>

Rails简单就像带有AJAX jQuery的按钮

1 个答案: