让 fields_for 使用 has_many 关系 [英] Getting fields_for to work with has_many relationship

问题描述

我在生成嵌套模型表单时遇到问题.

I'm having trouble generating a nested model form.

这是我的模型:

class Workout < ActiveRecord::Base
    has_many :scores
    has_many :users, :through => :scores
    accepts_nested_attributes_for :scores
end

class Score < ActiveRecord::Base
    belongs_to :user
    belongs_to :workout
end

class User < ActiveRecord::Base
    has_many :scores
    has_many :workout, :through => :scores
end

在锻炼控制器中，这是我的新动作:

In the Workout controller, here's what I have for the new action:

def new
    @workout = Workout.new
    3.times { @workout.scores.build }

    respond_to do |format|
        format.html # new.html.erb
        format.json { render json: @wod }
    end
end

但是，在表单中，当我尝试 fields_for 时，我什么也没得到:

However, in the form, when I try fields_for, I don't get anything:

<% f.fields_for :scores do |builder| %>
    <p>
        <%= builder.label :score %><br />
        <%= builder.text_field :score %>
    </p>
<% end %>

我做错了什么?

推荐答案

事实证明，在 Rails 3 中，我需要使用 <%= fields_for ... %> 而不是 <% fields_for ... %>.

It turns out in Rails 3, I need to use <%= fields_for ... %> instead of <% fields_for ... %>.

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