我对 Rails 和 MongoDB 绝对是陌生的。我一直在遵循一本好书中的教程,并使用一个简单的 Twitter 副本创建了我的第一个 Rails 应用程序。一切都很顺利。
但作为我学习过程的一部分,我想使用 MongoDB 而不是默认的 SGBD 构建相同的应用程序。
因此,我配置了 mongo 并安装了 mongo_mapper gem。按照本教程,所有内容均已正确配置: http://www .mongodb.org/display/DOCS/Rails+3+-+入门+开始。然后我费了一番功夫才让 Rails generated 能够正常工作,而又不会抛出 --orm not specified 错误。为了解决这个问题,我必须添加 Rails3-generators gem 并将其添加到 Gemfile 中。
当这一切都完成后,一切都顺利进行。我能够成功启动 Rails 服务器。
感谢生成,我添加了一个用户控制器。该页面工作正常,甚至列出了我之前添加的用户:
但是所有其他操作,显示,编辑,删除等不起作用(创建作品,但随后显示并出现错误):
这是所有不同的操作几乎都会出现相同的错误。
我立刻注意到的一个区别是,对于非 MongoDB 数据库,用户的 id 是从 1 开始的,等等。但是对于 MongoDB,它看起来像是一个随机生成的 id,要复杂得多,而且不是int 类型:4d2ae91d4403baa84a000002
我认为这可能会造成问题,因为所有操作都使用 id 作为参数......但我不知道如何解决这个问题。我查看了 ruby 生成的代码,它对我来说看起来不错(与默认数据库生成的代码非常相似)。
任何帮助将不胜感激!如果不解决使用 mongodb 的简单生成代码,我不知道如何继续我的项目。
谢谢,
亚历
克斯附:
请注意我根本没有编写任何这段代码。一切都已生成,这就是为什么我希望从一开始就开始工作...
正如这里所要求的是 users_controllers 的代码:
class UsersController < ApplicationController
# GET /users
# GET /users.xml
def index
@users = User.all
respond_to do |format|
format.html # index.html.erb
format.xml { render :xml => @users }
end
end
# GET /users/1
# GET /users/1.xml
def show
@user = User.first(params[:id])
respond_to do |format|
format.html # show.html.erb
format.xml { render :xml => @user }
end
end
# GET /users/new
# GET /users/new.xml
def new
@user = User.new
respond_to do |format|
format.html # new.html.erb
format.xml { render :xml => @user }
end
end
# GET /users/1/edit
def edit
@user = User.first(params[:id])
end
# POST /users
# POST /users.xml
def create
@user = User.new(params[:user])
respond_to do |format|
if @user.save
format.html { redirect_to(@user, :notice => 'User was successfully created.') }
format.xml { render :xml => @user, :status => :created, :location => @user }
else
format.html { render :action => "new" }
format.xml { render :xml => @user.errors, :status => :unprocessable_entity }
end
end
end
# PUT /users/1
# PUT /users/1.xml
def update
@user = User.first(params[:id])
respond_to do |format|
if @user.update(params[:user])
format.html { redirect_to(@user, :notice => 'User was successfully updated.') }
format.xml { head :ok }
else
format.html { render :action => "edit" }
format.xml { render :xml => @user.errors, :status => :unprocessable_entity }
end
end
end
# DELETE /users/1
# DELETE /users/1.xml
def destroy
@user = User.first(params[:id])
@user.destroy
respond_to do |format|
format.html { redirect_to(users_url) }
format.xml { head :ok }
end
end
end
I am absolutely totally news to Rails and to MongoDB. I have been following tutorials from a good book and create my first Rails app with a light Twitter copy. Everything went fine and smooth.
But as part of my learning process I wanted to build the same app using MongoDB rather than the default SGBD.
I therefore configured mongo and installed the mongo_mapper gem. Everything has been configured properly following this tutorial: http://www.mongodb.org/display/DOCS/Rails+3+-+Getting+Started. Then I struggled a little bit to allow Rails generate to work without throwing me the --orm not specified error. In order to get past this I had to add the rails3-generators gem and add it to the Gemfile.
Once all this was done, everything worked fine. I was able to successfully launch the Rails server.
I added a User controller thanks to the generate. The page works fine and even lists the users I have previously added:
However all the other actions, showing, editing, deleting, etc. are not working (creating works, but then it goes to show and the errors comes):
It's virtually the same error for all different actions.
The one difference I can notice right off the bat is that with the non MongoDB db, the id's of the user was starting at 1, etc. but here with MongoDB it looks like a randomly generated id that is much more complex and that is not of type int: 4d2ae91d4403baa84a000002
I am thinking that this may be creating the issues, since all action are using the id as a parameter... but I have no idea how to fix this. I have looked at the ruby generated code and it looks alright to me (extremely similar to the code generate for the default db).
Any help would be greatly appreciated ! I don't know how to go forward with my project without solving a simple generate code with mongodb.
Thanks,
Alex
ps:
please that I did not write any of this code at all. everything has been generated, which is kinda why I expected to work from the get go...
as asked here is the code for users_controllers:
class UsersController < ApplicationController
# GET /users
# GET /users.xml
def index
@users = User.all
respond_to do |format|
format.html # index.html.erb
format.xml { render :xml => @users }
end
end
# GET /users/1
# GET /users/1.xml
def show
@user = User.first(params[:id])
respond_to do |format|
format.html # show.html.erb
format.xml { render :xml => @user }
end
end
# GET /users/new
# GET /users/new.xml
def new
@user = User.new
respond_to do |format|
format.html # new.html.erb
format.xml { render :xml => @user }
end
end
# GET /users/1/edit
def edit
@user = User.first(params[:id])
end
# POST /users
# POST /users.xml
def create
@user = User.new(params[:user])
respond_to do |format|
if @user.save
format.html { redirect_to(@user, :notice => 'User was successfully created.') }
format.xml { render :xml => @user, :status => :created, :location => @user }
else
format.html { render :action => "new" }
format.xml { render :xml => @user.errors, :status => :unprocessable_entity }
end
end
end
# PUT /users/1
# PUT /users/1.xml
def update
@user = User.first(params[:id])
respond_to do |format|
if @user.update(params[:user])
format.html { redirect_to(@user, :notice => 'User was successfully updated.') }
format.xml { head :ok }
else
format.html { render :action => "edit" }
format.xml { render :xml => @user.errors, :status => :unprocessable_entity }
end
end
end
# DELETE /users/1
# DELETE /users/1.xml
def destroy
@user = User.first(params[:id])
@user.destroy
respond_to do |format|
format.html { redirect_to(users_url) }
format.xml { head :ok }
end
end
end
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嗯,看来我找到了 pb...
我替换为:
但是
再次生成了此代码...那么错误来自哪里? Rails3-generators 中是否存在“错误”?还是我搞砸了这一代人?
亚历克斯
Hummm so it seems I found the pb...
I replaced:
by
But again, this code was generated... so where does the error come from ? Is there a "bug" in rails3-generators ? Or somehow I screwed up the generation ?
Alex