仍然使用Ruby，Rails和ActiveRecord来获取我的海底......
目前，我正在将闪存通知集成到我的应用程序中（rails 4，ruby 2.1）。我已经开始使用MetaCategory activerecord类了。我正在使用ajax来回移动数据。因此，为了实现flash消息，我构建了创建，更新和销毁动作视图，如下所示：
Create.js.erb / Update.js.erb / Destroy.js.erb：
<% flash.each do |type, message| %>
$('#flash_messages').html("<div class='alert <%= bootstrap_class_for(type) %> alert-dismissible' role='alert'><buttonclass='close' data-dismiss='alert'>×</button><%= message.html_safe%></div>")
<% end %>
我的问题是：在创建和销毁时，我的flash消息会按原样显示。在更新时，它们不会显示。
这是MetaCategories控制器中的创建，更新和销毁活动的代码。我应该指出，在更新的代码中，我尝试了几种不同的策略，它们会产生两种不同的响应。
如果我放弃respond_to做.. render .. end，我收到一个丢失的模板错误（下面的跟踪）。如果我把它放入，我不再收到错误。在这两种情况下，我都看不到flash消息。更让我困惑的是，更新代码是唯一似乎需要respond_to做的代码。毁灭和创造似乎并不关心。 （我是否提到我是铁轨世界的新手？）
无论如何，代码：
def create
# TODO: need uniqueness test for new Metas
if params[:commit]=='Save'
if current_user.try(:admin?)
@meta_category = MetaCategory.create(meta_category_params)
flash[:notice]='Meta category has been created.'
else
MetaCategoryProposedChange.create(new_meta_category: meta_category_params[:name],
proposing_user_id: current_user.id)
flash[:notice]='Your proposed new meta category has been recorded. You will be notified when it has been reviewed.'
end
end
end
def update
# TODO: need uniqueness test for updated Metas
if current_user.try(:admin?)
@meta_category.update(meta_category_params)
flash[:notice]='Meta category has been updated.'
respond_to do |format|
format.json { render 'update.js.erb', json: @meta_category }
end
else
MetaCategoryProposedChange.create(meta_category_id: @meta_category.id,
new_meta_category: meta_category_params[:name],
proposing_user_id: current_user.id)
flash[:notice]='Your proposed change has been recorded. You will be notified when it has been reviewed.'
respond_to do |format|
format.json { render 'update.js.erb', json: @meta_category, :status => 400 }
end
end
end
def destroy
if current_user.try(:admin?)
@meta_category.destroy
flash[:notice]='Meta category has been deleted.'
end
end
追踪：
Started PUT "/meta_categories/95" for 127.0.0.1 at 2014-11-25 11:10:56 -0500
Processing by MetaCategoriesController#update as JSON
Parameters: {"meta_category"=>{"name"=>"#BETABETA"}, "authenticity_token"=>"+Ui6n7tpUPRbGsmFW7RXGbH461Y0UueGSVmi8GlKjqY=", "id"=>"95"}
User Load (0.3ms) SELECT `users`.* FROM `users` WHERE `users`.`id` = 1 ORDER BY `users`.`id` ASC LIMIT 1
MetaCategory Load (0.2ms) SELECT `meta_categories`.* FROM `meta_categories` WHERE `meta_categories`.`id` = 95 LIMIT 1
(0.1ms) BEGIN
SQL (0.3ms) UPDATE `meta_categories` SET `name` = '#BETABETA', `updated_at` = '2014-11-25 16:10:56' WHERE `meta_categories`.`id` = 95
(1.4ms) COMMIT
Completed 500 Internal Server Error in 9ms
ActionView::MissingTemplate (Missing template meta_categories/update, application/update with {:locale=>[:en], :formats=>[:json], :handlers=>[:erb, :builder, :raw, :ruby, :jbuilder, :coffee]}. Searched in:
* "/Users/cboebel/Documents/Development/Ruby/VerbQ/app/views"
* "/Users/cboebel/.rvm/gems/ruby-2.1.0/gems/devise-3.4.0/app/views"
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/Users/cboebel/.rvm/rubies/ruby-2.1.0/lib/ruby/2.1.0/webrick/server.rb:295:in `block in start_thread'
Rendered /Users/cboebel/.rvm/gems/ruby-2.1.0/gems/actionpack-4.0.0/lib/action_dispatch/middleware/templates/rescues/missing_template.erb within rescues/layout (0.7ms)
所以..不确定如何继续。我在这个网站上看到了关于需要告诉如何响应的rails的各种答案，并且当我添加respond_to时我丢失了错误。但令我困扰的是，它似乎没有在update.js.erb中执行我的代码。
谢谢！
答案 0 :(得分：0)
你的答案在这里：
def update
# TODO: need uniqueness test for updated Metas
if current_user.try(:admin?)
@meta_category.update(meta_category_params)
flash[:notice]='Meta category has been updated.'
respond_to do |format|
format.json { render json: @meta_category, :status => 400 }
format.js
end
else
MetaCategoryProposedChange.create(meta_category_id: @meta_category.id,
new_meta_category: meta_category_params[:name],
proposing_user_id: current_user.id)
flash[:notice]='Your proposed change has been recorded. You will be notified when it has been reviewed.'
respond_to do |format|
format.json { render json: @meta_category, :status => 400 }
format.js
end
end