在Rails中将多级嵌套表单标记为“脏”

时间:2010-03-12 20:50:48

标签: ruby-on-rails ruby forms nested-forms

我在Rails中有一个三级多嵌套表单。设置如下:项目有许多里程碑,里程碑有很多笔记。目标是使用JavaScript在页面中编辑所有内容,我们可以在页面中的项目中添加多个新的里程碑,并将新的Notes添加到新的和现有的里程碑。

一切都按预期工作,除了当我向现有的里程碑添加新笔记时(新的里程碑在向他们添加笔记时工作正常),新笔记将不会保存,除非我编辑任何实际上属于里程碑的字段标记“脏”/编辑的形式。

有没有办法标记里程碑,以便添加的新Notes会保存?

编辑:抱歉,很难粘贴所有代码,因为有太多的部分,但是这里有:

模型

class Project < ActiveRecord::Base
  has_many :notes, :dependent => :destroy
  has_many :milestones, :dependent => :destroy

  accepts_nested_attributes_for :milestones, :allow_destroy => true
  accepts_nested_attributes_for :notes, :allow_destroy => true, :reject_if => proc { |attributes| attributes['content'].blank? }
end

class Milestone < ActiveRecord::Base
  belongs_to :project
  has_many :notes, :dependent => :destroy

  accepts_nested_attributes_for :notes, :allow_destroy => true, :allow_destroy => true, :reject_if => proc { |attributes| attributes['content'].blank? }
end

class Note < ActiveRecord::Base
  belongs_to :milestone
  belongs_to :project

  scope :newest, lambda { |*args| order('created_at DESC').limit(*args.first || 3) }
end

我正在使用基于jQuery的,不引人注目的Ryan Bates的组合助手/ JS代码来完成这项工作。

应用程序助手

def add_fields_for_association(f, association, partial)
  new_object = f.object.class.reflect_on_association(association).klass.new
  fields = f.fields_for(association, new_object, :child_index => "new_#{association}") do |builder|
    render(partial, :f => builder)
  end
end

我在隐藏的div中渲染关联的表单,然后使用以下JavaScript找到它并根据需要添加它。

的JavaScript

function addFields(link, association, content, func) {
    var newID = new Date().getTime();
    var regexp = new RegExp("new_" + association, "g");
    var form = content.replace(regexp, newID);
    var link = $(link).parent().next().before(form).prev();
    if (func) {
        func.call();
    }
    return link;
}

我猜测我能想到的唯一其他相关代码片段是NotesController中的create方法:

def create
  respond_with(@note = @owner.notes.create(params[:note])) do |format|
    format.js   { render :json => @owner.notes.newest(3).all.to_json }
    format.html { redirect_to((@milestone ? [@project, @milestone, @note] : [@project, @note]), :notice => 'Note was successfully created.') }
  end
end

@owner ivar在过滤器之前创建如下:

def load_milestone
  @milestone = @project.milestones.find(params[:milestone_id]) if params[:milestone_id]
end

def determine_owner
  @owner = load_milestone || @project
end

事实上,除非我在现有里程碑中添加新笔记,否则这一切似乎都能正常工作。必须“触摸”里程碑才能保存新笔记,否则Rails不会引起注意。

2 个答案:

答案 0 :(得分:2)

这是Rails 2.3.5中的bug #4242,它在Rails 2.3.8中一直是fixed

答案 1 :(得分:0)

我认为你的模特是错的。注释与项目没有直接关系。他们是通过里程碑。

试试这些

class Project < ActiveRecord::Base
  has_many :milestones, :dependent => :destroy
  has_many :notes, :through => :milestones
  accepts_nested_attr ibutes_for :milestones, :allow_destroy => true
end

class Milestone < ActiveRecord::Base
  belongs_to :project
  has_many :notes, :dependent => :destroy

  accepts_nested_attributes_for :notes, :allow_destroy => true, :reject_if => proc { |attributes| attributes['content'].blank? }
end

class Note < ActiveRecord::Base
  belongs_to :milestone
end

更新:这是根据新信息为我工作的代码:

## project controller

# PUT /projects/1
def update
  @project = Project.find(params[:id])

  if @project.update_attributes(params[:project])
    redirect_to(@project)
  else
    render :action => "edit"
  end
end

# GET /projects/1/edit
def edit
  @project = Project.find(params[:id])
  @project.milestones.build
  for m in @project.milestones
    m.notes.build
  end
  @project.notes.build
end

## edit.html.erb
<% form_for(@project) do |f| %>
  <%= f.error_messages %>

  <p>
    <%= f.label :name %><br />
    <%= f.text_field :name %>
  </p>
  <% f.fields_for :notes do |n| %>
      <p>
        <div>
          <%= n.label :content, 'Project Notes:' %>
          <%= n.text_area :content, :rows => 3 %>
        </div>
      </p>
  <% end %>
  <% f.fields_for :milestones do |m| %>
      <p>
        <div>
          <%= m.label :name, 'Milestone:' %>
          <%= m.text_field :name %>
        </div>
      </p>
      <% m.fields_for :notes do |n| %>
          <p>
            <div>
              <%= n.label :content, 'Milestone Notes:' %>
              <%= n.text_area :content, :rows => 3 %>
            </div>
          </p>
      <% end %>
  <% end %>
  <p>
    <%= f.submit 'Update' %>
  </p>
<% end %>