Rails 4.创建模型时属性不保存

Question

我很难理解为什么这不起作用。我有一个评论系统，并有一个链接来创建一个新的评论，通过2个属性; user_id和gigid。这两个id都是作为整数生成的，但是当我保存评论时，这个gigid保存为'nil'而不是整数。

检视：

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

这里既有ID的正确设置（根据服务器输出）。 User_id是要被审查的用户（正常工作），而gigid是后验证的参考。 （正常工作，直到我试图保存）

_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 

服务器输出，当点击链接：

Started GET "https://stackoverflow.com/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) 

我再添加评论和评级和点击创建。点击创建时 服务器输出：

Started POST "https://stackoverflow.com/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”被完全忽略了这里，但一切可以节省的罚款。 我不明白为什么一个属性保存，另一个不存在，任何有识之士将不胜感激！

Answer 1

您的形式没有任何东西gigid将其发送到create行动。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

有没有gigid在审查参数。在执行POST时仔细查看你的参数："review"=>{"rating"=>"5", "comment"=>"sdfsdfdd"}。只需审查和评论。并且之后你正在做的：

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