我被困在嵌套形式和活动记录使用中间的“find_or_create_by”方法..我试图做的事:嵌套形式:find_or_create_by多个字段
我有3种型号:帐户,交易和类别。
class Account < ActiveRecord::Base
has_many :transactions, :dependent => :destroy
has_many :categories, :dependent => :destroy
end
class Category < ActiveRecord::Base
has_many :transactions
belongs_to :account
end
class Transaction < ActiveRecord::Base
belongs_to :category, :autosave => true
belongs_to :account
accepts_nested_attributes_for :category
end
我的形式是这样的:应用程序/视图/交易/ new.haml
= semantic_form_for @transaction do |f|
= f.inputs do
= f.input :account_id, :as => :hidden
= f.input :title, :label => false
= f.input :amount, :label => false
= f.inputs :for => :category do |c|
= c.input :title, :as => :string
= c.input :account_id, :as => :hidden
= f.buttons do
= f.submit "Save"
我的控制器是这样的:
class TransactionsController < ApplicationController
def new
@transaction = Transaction.new
@transaction.date ||= Transaction.last.date if Transaction.last
@transaction.account= Account.find(params[:account]) if params[:account]
@account = @last_transaction.account if @last_transaction
@account = Account.find(params[:account]) if params[:account]
@transaction.build_category(:account => @account)
end
def create
@transaction = Transaction.new(params[:transaction])
@account = @transaction.account
respond_to do |format|
if @transaction.save
format.html {redirect_to (new_transaction_path(:account => @account))}
else
format.html {redirect_to (new_transaction_path(:account => @account))}
end
end
end
end
类别控制器:
class CategoriesController < ApplicationController
before_filter :authenticate_user!
def new
@category = Category.new
@category.account = Account.find(params[:account]) if params[:account]
@accounts = current_user.accounts
end
def create
@category = Category.new(params[:category])
respond_to do |format|
if @category.save
format.html {redirect_to (categories_path)}
else
format.html {render :action => "new"}
end
end
end
def update
@category = Category.find(params[:id])
respond_to do |format|
if @category.update_attributes(params[:category])
format.html {redirect_to (categories_path)}
else
format.html {render :action => "edit"}
end
end
end
end
现在,我卡住了。我只想创建一个新类别,如果还没有一个具有相同标题和相同account_id的现有类别。
现在,它总是创建一个新的类别,忽略已经有一个具有相同名称和相同account_id的类别。我知道,我应该使用这样的事情:
Category.find_or_create_by_title_and_account_id(category.title, account.id)
但我应该在哪里使用它,它应该如何看到底是什么?
我真的很感谢你的帮忙!
那么你的控制器代码在哪里? – fl00r 2012-02-11 10:53:10
我添加了控制器代码。 – algi 2012-02-11 11:01:37