首先,我已经找到了一些非常有帮助的答案(请参阅下面的链接),但我仍然努力做到这一点。我没有长时间的编程,而且这绝对是我舒服自称理解的东西。Rails 4 form_for双重嵌套注释
我有三种模式。举例来说,我会称它们为树,树皮,雕刻(评论)。我正在尝试为用户添加一个简单的表单部分以提交新评论(雕刻)。
的下面设置是制造误差:
NoMethodError在/树木/ 1 未定义的方法`树”的零:NilClass
控制器
class TreesController < ApplicationController
def show
@barks = Bark.where(tree_id: @tree.id)
@engraving= Engraving.new(:bark=> @bark)
end
end
class BarksController < ApplicationController
def show
@engravin= Engraving.new(:bark=> @bark)
@engravings = Engraving.where(bark_id: @bark.id)
end
end
class EngravingsController < ApplicationController
def show
@bark= Bark.find(params[:bark_id])
@engraving = Engraving.new(params[:engraving])
end
end
def create
@bark = Bark.find(params[:bark_id])
@engraving = Engraving.new(params[:engraving])
@engraving.user_id = current_user.id
respond_to do |format|
if @engraving.save
format.html { redirect_to tree_bark_path(@tree, @bark), notice: 'Comment was successfully created.' }
format.json { render action: 'show', status: :created, location: @engraving}
else
format.html { render action: 'new' }
format.json { render json: @engraving.errors, status: :unprocessable_entity }
end
end
端
模型
class Tree < ActiveRecord::Base
belongs_to :user
has_many :barks
has_many :engravings, through: :barks
end
class Bark< ActiveRecord::Base
belongs_to :user
belongs_to :tree
has_many :engravings
delegate :title, :link, :to => :tree, :prefix => true
def new_engraving_path
Rails.application.routes.url_helpers.new_tree_bark_engraving_path(book, self)
end
def serializable_hash(*args)
super.merge 'new_engraving_path' => new_engraving_path
end
end
class Engraving< ActiveRecord::Base
belongs_to :user
belongs_to :bark
delegate :tree, :to => :bark, :prefix => true
def to_edit_path
Rails.application.routes.url_helpers.edit_tree_bark_engraving_path bark_tree, bark, self
end
def to_path
Rails.application.routes.url_helpers.tree_bark_engraving_path bark_tree, bark, self
end
def serializable_hash(*args)
super.merge 'path' => to_path, 'edit_path' => to_edit_path
end
end
在视图中调用窗体
在树显示页面上,我将所有树皮填充到那里。点击一个Bark元素打开一个模式,显示Bark.content和Engravings。在最后的雕刻下,我想要一个text_area表单来创建一个新的雕刻,并将其添加到这片“树皮”中。
# trees\show.html.erb
<%= render @barks %>
# barks\_bark.html.erb
<%= render partial: 'barks/modal', locals: { bark: bark} %>
# barks\modal.html.erb
<% render partial: '/engravings/simpleForm', :collection => bark.engravings %>
# Form partial
<%= form_for @engraving, :url => (new_tree_bark_engraving_path(:tree_id => @bark.tree, :bark_id => @bark.id)) do |f| %>
<%= f.hidden_field :bark_id %>
<div class="field">
<%= f.text_area :content %>
</div>
<div class="actions">
<%= f.submit %>
</div>
<% end %>
路线
get "pages/home"
resources :trees do
collection do
get 'search'
post 'load_from_api'
end
resources :barks do
resources :engravings
end
end
resources :barks do
resources :engravings
end
root "trees#index"
对方的回答来源
Rails Routing Error for nested form_for
Twice Nested Resource Form_For Issue
form_for with nested resources
谢谢!变量现在正在传入。 – user1573016 2014-10-02 22:12:49
表单现在显示多次。我检查了部分电话,但事实并非如此。表格数量与之前提交的评论数量相同。为什么评论的数量会决定要显示多少表格? – user1573016 2014-10-03 00:14:20
问题在于部分调用中的:collection。现在全部修好! – user1573016 2014-10-03 00:32:55