Rails 4. 创建模型时属性不保存

Question

我很困惑为什么这不起作用。我有一个评论系统，以及一个创建新评论的链接，通过 2 个属性； user_id 和 gigid。两个 id 都生成为整数，但是当我保存评论时，gigid 保存为“nil”而不是整数。

查看：

<%= link_to 'Click here to rate this user', new_user_review_path(:user_id => request.user.id, :gigid => request.gig.id) %>

这里两个 ID 都设置正确（根据服务器输出）。 User_id 是要审核的用户（正常工作），gigid 是后期验证的参考。 （在我尝试保存之前正常工作）

_form :

<%= simple_form_for([@user, @user.reviews.build]) do |f| %>
<div id="rating-form">
<label>Rating</label>
</div>
<%= f.input :comment %>
<%= f.button :submit %>

<% end %>

控制器：

def new
    if user_signed_in?
    @review = current_user.reviews.new
  else
    redirect_to(root_url)
    flash[:danger] = "You must log in to rate a user"
  end
  end

def create
    @review = @user.reviews.new review_params
    @review.reviewed_id = current_user.id
       if @review.save
      redirect_to user_path(@user)
    else
      render 'new'
    end
  end

private

    def review_params
      params.require(:review).permit(:rating, :comment, :gigid, :user_id)
    end
end

点击链接时的服务器输出：

Started GET "/users/21/reviews/new?gigid=17&locale=en" for 127.0.0.1 at 2016-01-13 18:08:26 +0100
Processing by ReviewsController#new as HTML
  Parameters: {"gigid"=>"17", "locale"=>"en", "user_id"=>"21"}
  User Load (0.2ms)  SELECT  "users".* FROM "users" WHERE "users"."id" = ? LIMIT 1  [["id", 21]]
  User Load (0.2ms)  SELECT  "users".* FROM "users" WHERE "users"."id" = ?  ORDER BY "users"."id" ASC LIMIT 1  [["id", 1]]
  Rendered reviews/_form.html.erb (4.9ms)

然后我添加评论和评级并单击创建。 单击创建时的服务器输出：

Started POST "/users/21/reviews?locale=en" for 127.0.0.1 at 2016-01-13 18:10:44 +0100
Processing by ReviewsController#create as HTML
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"RToZwvodvXxQp1/spEhgemO/oi+4rof8jREuLw27CcEsEBqFWGLeYne1CgH3kvWu9OzAV+bHvOk9g9nq8JMPnw==", "review"=>{"rating"=>"5", "comment"=>"sdfsdfdd"}, "commit"=>"Create Review", "locale"=>"en", "user_id"=>"21"}
  User Load (0.3ms)  SELECT  "users".* FROM "users" WHERE "users"."id" = ? LIMIT 1  [["id", 21]]
  User Load (0.4ms)  SELECT  "users".* FROM "users" WHERE "users"."id" = ?  ORDER BY "users"."id" ASC LIMIT 1  [["id", 1]]
   (0.1ms)  begin transaction
  SQL (0.7ms)  INSERT INTO "reviews" ("rating", "comment", "user_id", "reviewed_id", "created_at", "updated_at") VALUES (?, ?, ?, ?, ?, ?)  [["rating", 5], ["comment", "sdfsdfdd"], ["user_id", 21], ["reviewed_id", 1], ["created_at", "2016-01-13 17:10:44.675386"], ["updated_at", "2016-01-13 17:10:44.675386"]]
   (93.6ms)  commit transaction

我注意到“gigid”在这里被完全忽略了，但其他一切都很好。 我不明白为什么一个属性保存而另一个不保存，任何见解将不胜感激！

Answer 1

您的表单没有任何内容供gigid 将其发送到create 操作。您可以使用如下形式的隐藏字段

<%= simple_form_for([@user, @user.reviews.build]) do |f| %>
  <div id="rating-form">
    <label>Rating</label>
  </div>
  <%= f.input :comment %>
  <%= f.input :gigid, :as => :hidden, :input_html => { :value => params[:gigid] }
  <%= f.button :submit %>
<% end %>

Answer 2

评论参数中没有gigid。执行 POST 时仔细查看参数："review"=>{"rating"=>"5", "comment"=>"sdfsdfdd"}。只需审查和评论。之后你正在做：

params.require(:review).permit(:rating, :comment, :gigid, :user_id)