fields_for 表单构建器对象为零 [英] fields_for form builder object is nil

问题描述

有什么方法可以访问嵌套的 form_bulder.object?

Any way to access a nested form_bulder.object?

## controller
@project = Project.new
@project.tasks.build

form_for(@project) do |f|
  f.object.nil? ## returns false

  fields_for :tasks do |builder|
    builder.object.nil? ## returns true
  end
end

推荐答案

您必须在 Project 模型中有 accepts_nested_attributes_for 才能传递对象.

You must have accepts_nested_attributes_for in the Project model in order for the object to be passed.

class Project < ActiveRecord::Base
  has_many :tasks
  accepts_nested_attributes_for :tasks ## this is required
end

这篇关于fields_for 表单构建器对象为零的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！