5

我在 Rails 中有一个三层多嵌套的表单。设置是这样的:项目有很多里程碑,里程碑有很多笔记。目标是让页面内的所有内容都可以使用 JavaScript 进行编辑,我们可以在页面内向一个项目添加多个新里程碑,并向新的和现有的里程碑添加新的注释。

一切都按预期工作,除了当我向现有里程碑添加新注释时(新里程碑在向它们添加注释时工作正常),除非我编辑任何实际属于里程碑的字段来标记,否则新注释不会保存表格“脏”/已编辑。

有没有办法标记里程碑,以便保存已添加的新注释?

编辑:抱歉,很难粘贴所有代码,因为有很多部分,但这里是:

楷模

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 Ryan Bates 的组合助手/JS 代码的基于 jQuery 的不显眼版本来完成这项工作。

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 中呈现关联表单,然后使用以下 JavaScript 找到它并根据需要添加它。

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;
}

我猜我能想到的唯一其他相关代码将是 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 在以下过滤器之前创建:

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

def determine_owner
  @owner = load_milestone || @project
end

问题是,这一切似乎都很好,除非我向现有里程碑添加新注释。必须“触摸”里程碑才能保存新笔记,否则 Rails 不会注意。

4

2 回答 2

2

这是Rails 2.3.5 中的错误 #4242,它已在 Rails 2.3.8 中修复。

于 2010-06-25T21:27:53.147 回答
0

我认为你的模型是错误的。注释与项目没有直接关系。他们正在经历里程碑。

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 %>
于 2010-03-13T02:37:14.960 回答