rails form_for中的单选按钮值不属于params [:model] [英] Radio button value in rails form_for not being part of params[:model]

问题描述

我有一个模型(CustInfo)，其中包含3个属性:cust_name，年龄，性别.在我的编辑视图中，我使用form_for提交表单:

I have an model (CustInfo), which contains 3 attributes: cust_name, age, gender. In my edit view, I use form_for for form submission:

<%= form_for @cust[0] do |cust| %>
    <label for="cname">Customer name: </label>
    <%= cust.text_field :cust_name, :size => 20 %>

    <label for="age">Customer age: </label>
    <%= cust.text_field :age, :size => 5 %>

    <label for="gender">Gender </label>
    <%= radio_button_tag(:gender, "F", :checked => (:gender == 'female')? true:false) %><span style="float:left">F</span>
    <%= radio_button_tag(:gender, "M", :checked => (:gender == 'male')? true:false) %><span style="float:left">M</span>        
    <%= cust.submit "Save" %>
<% end %>

在我的控制器中，

def update
    if Cust.update_all(params[:custinfo])
        flash[:notice] = "Successfully updated!"
        redirect_to :action => "index"
    else
        flash[:notice] = "There are errors in the form, please try again"
        render :action => "edit"
    end
end

当我按下提交"按钮时，提交的表单及其参数如下:

When I press submit button, the form submitted, and its parameters are like this:

Parameters: {"utf8"=>"✓", "authenticity_token"=>"I9QEdP1mRr65wT9TRbzNokkaa+LHVyPfmgWJMKoup", "custinfo"=>{"age"=>"16", "cust_name"=>"jsmith"}, "gender"=>"M","commit"=>"Save"}.

看起来性别确实可以通过参数传递，但是它不在参数[:model]内，在这种情况下，参数[:custinfo]也就不存在，这就是为什么update函数不会更新该值的原因(因为我只有Cust .update_all(params [:custinfo]).我的问题是，为什么只有这个单选按钮不在params [:custinfo]中，而其他两个在?以及如何在params [:custinfo]中传递单选按钮值?谢谢！

It looks like gender does get passed through params, but it's not within the params[:model], in this case params[:custinfo] and that's why the update function wouldn't update this value (because I only had Cust.update_all(params[:custinfo])). My question is that why only this radio button isn't in params[:custinfo], while the other two are? And how can I pass the radio button value inside params[:custinfo]? Thanks!

推荐答案

尝试将radio_button_tag调用替换为cust.radio_button，以使Rails知道这些单选按钮适用于您的Customer模型.

Try replacing your radio_button_tag calls with cust.radio_button so that Rails knows those radio buttons apply to your Customer model.

您还可以将:checked => (:gender == 'female')? true:false简化为:checked => (:gender == 'female')，因为==运算符可提供布尔结果.

You can also simplify the :checked => (:gender == 'female')? true:false to just :checked => (:gender == 'female') because the == operator gives a boolean result.

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