1
我需要的功能几乎相同的：Rails的4 simple_form_for，通过的has_many和嵌套属性
https://robots.thoughtbot.com/accepts-nested-attributes-for-with-has-many-through
，我已经去了一圈又一圈（及周边）试图让它正常运行，但仍然遇到障碍。对于Ruby和Rails，我还是有些新鲜，并且需要在向前迈进时提供帮助。下面是我的实现，因为它目前存在：
/models/transfer.rb
class Transfer < ActiveRecord::Base
validates :name, presence: true,
uniqueness: { case_sensitive: false }
has_many :transfer_accounts, inverse_of: :transfer
has_many :accounts, through: :transfer_accounts
accepts_nested_attributes_for :transfer_accounts
end
/models/transfer_account.rb
class TransferAccount < ActiveRecord::Base
validates :account_transfer_role, presence: true
belongs_to :account, inverse_of: :transfer_accounts
belongs_to :transfer, inverse_of: :transfer_accounts
validates :account, presence: true
validates :transfer, presence: true
accepts_nested_attributes_for :account
end
/models/account.rb
class Account < ActiveRecord::Base
validates :name, presence: true,
uniqueness: { case_sensitive: false }
validates :user_name, presence: true
validates :password, presence: true
validates :account_number, presence: true,
uniqueness: { case_sensitive: false }
validates :routing_number, presence: true
has_many :transfer_accounts, inverse_of: :account
has_many :transfers, through: :transfer_accounts
belongs_to :bank, inverse_of: :accounts
end
/models/bank.rb
class Bank < ActiveRecord::Base
validates :name, presence: true,
uniqueness: { case_sensitive: false }
validates :connect_uri, presence: true
has_many :accounts
end
/controllers/transfers_controller.rb
class TransfersController < ApplicationController
def new
@transfer = Transfer.new
@transfer.transfer_accounts.build(account_transfer_role: 'source').build_account
@transfer.transfer_accounts.build(account_transfer_role: 'destination').build_account
@valid_banks = Bank.all.collect {|c| [c.name, c.id]} # available banks seeded in database
end
def index
@transfers = Transfer.all
end
def show
@transfer = resource
end
def create
@transfer = Transfer.new(transfer_params)
if @transfer.save
redirect_to transfers_path, notice: "Transfer Created"
else
redirect_to transfers_path, alert: "Transfer Not Created"
end
end
def edit
resource
end
def update
if resource.update_attributes(transfer_params)
redirect_to transfers_path(resource), notice: "Transfer Updated"
else
redirect_to edit_transfer_path(resource), alert: "Transfer Not Updated"
end
end
def destroy
resource.destroy
end
private
def resource
@transfer ||= transfer.find(params[:id])
end
def transfer_params
params.require(:transfer).
permit(:name, :description,
transfer_accounts_attributes:
[:account_transfer_role,
account_attributes:
[:name, :description, :user_name, :password,
:routing_number, :account_number
]
])
end
end
/controllers/banks_controller.rb
class BanksController < ApplicationController
def index
@bank = Bank.new
@banks = Bank.by_last_updated_at
end
def show
@bank = resource
end
def create
@bank = Bank.new(bank_params)
if @bank.save
redirect_to banks_path, notice: "Bank Created"
else
redirect_to banks_path, alert: "Bank Not Created"
end
end
def edit
resource
end
def update
if resource.update_attributes(bank_params)
redirect_to banks_path(resource), notice: "Bank Updated"
else
redirect_to edit_bank_path(resource), alert: "Bank Not Updated"
end
end
def destroy
resource.destroy
end
private
def resource
@bank ||= Bank.find(params[:id])
end
def bank_params
params.require(:bank).
permit(:name, :description, :connection_uri)
end
end
/views/transfers/_form.html.haml
= simple_form_for :transfer do |t|
.form-inputs
= t.input :name, label: "Transfer Name"
= t.input :description, required: false, label: "Transfer Description"
= t.simple_fields_for :transfer_accounts do |ta|
- role = ta.object.account_transfer_role.titleize
= ta.input :account_transfer_role, as: :hidden
= ta.simple_fields_for :account do |a|
= a.input :bank_id, collection: @valid_banks,
include_blank: 'Select bank...',
id: 'bank',
class: 'bank_selector',
label: '#{role} Bank',
error: '#{role} bank selection is required.'
= a.input :name, label: "#{role} Account Name"
= a.input :description, required: false, label: "#{role} Account Description"
= a.input :user_name, label: "#{role} Account User Name"
= a.input :password, label: "#{role} Account Password"
= a.input :account_number, label: "#{role} Account Number"
= a.input :routing_number, label: "#{role} Account Routing Number"
= t.submit
/db/migrate/20151102001000_create_transfers.rb
class CreateTransfers < ActiveRecord::Migration
def change
create_table :transfers do |t|
t.string :name, null: false, default: ''
t.text :description
t.timestamps
end
end
end
/db/migrate/20151102002000_create_transfer_accounts.rb
class CreateTransferAccounts < ActiveRecord::Migration
def change
create_table :transfer_accounts do |t|
t.string :account_transfer_role, null: false, default: ''
t.references :transfer, index: true
t.references :account, index: true
t.timestamps null: false
end
end
end
/db/migrate/20151102003000_create_accounts.rb
class CreateAccounts < ActiveRecord::Migration
def change
create_table :accounts do |t|
t.string :name, null: false, default: ''
t.string :description
t.string :user_name, null: false, default: ''
t.string :password, null: false, default: ''
t.string :account_number, null: false, default: ''
t.string :routing_number, null: false, default: ''
t.references :bank, index: true
t.timestamps
end
end
end
/db/migrate/20151102004000_create_banks.rb
class CreateBanks < ActiveRecord::Migration
def change
create_table :banks do |t|
t.string :name, null: false, default: ''
t.string :description
t.string :connection_uri, null: false, default: ''
t.timestamps
end
end
end
/db/migrate/20151102005000_add_foreign_keys_to_transfer_accounts.rb
class AddForeignKeysToTransferAccounts < ActiveRecord::Migration
def change
add_foreign_key :transfer_accounts, :accounts
add_foreign_key :transfer_accounts, :transfers
end
end
/db/migrate/20151102006000_add_foreign_keys_to_accounts.rb
class AddForeignKeysToAccounts < ActiveRecord::Migration
def change
add_foreign_key :accounts, :banks
end
end
/db/seeds.rb
Bank.create(name: 'Acme Savings and Loan',
description: 'The number one bank in the northeast',
connection_uri: 'https://www.acmesavings.com')
Bank.create(name: 'First Bank of Anytown',
description: 'The first and only bank in Anytown',
connection_uri: 'https://www.firstbankanytown.com')
Bank.create(name: 'Generibank',
description: 'The most generic bank in the country',
connection_uri: 'https://www.generibank.com')
/config/routes.rb
Rails.application.routes.draw do
resources :transfers
resources :accounts
resources :banks
root to: 'dashboard#index'
end
所以，目前我的问题是：
这条线在表单视图
- role = ta.object.account_transfer_role.titleize
是给我一个“未定义的方法`account_transfer_role”为零：NilClass“错误，那么我在那里做错了什么？为什么（或为什么会）的
accepts_nested_attributes_for线在transfer_account模型的工作？我的印象是，accepts_nested_attributes_for在协会的belongs_to一侧不起作用，因为它不是父母（或其他情况）。如果我注释掉与问题＃1相关的代码以避免该错误，表单将呈现，但我只获取
account嵌套属性的一组输入框。具有两个transfer_accounts和两个accounts在transfers_controller的“新”行动（的“源”与transfer_account:account_transfer_role价值观和“目的地”）建成并与它相关联，每个transfer我不应该会得到两套account嵌套属性输入框？单数/复数是否适合我的嵌套属性？基本上，我从他们的协会开始保持一致。例如，
transferhas_many :transfer_accounts，所以transfer_accounts是在以下所有的复数：/models/transfer.rb accepts_nested_attributes_for :transfer_accounts /controllers/transfers_controller.rb @transfer.transfer_accounts.build(account_transfer_role: 'source').build_account @transfer.transfer_accounts.build(account_transfer_role: 'destination').build_account . . . def transfer_params params.require(:transfer). permit(:name, :description, transfer_accounts_attributes: [:account_transfer_role, account_attributes: [:name, :description, :user_name, :password, :routing_number, :account_number ] ]) end /views/transfers/_form.html.haml = m.simple_fields_for :transfer_accounts do |ma|这同样适用于
account，除单数。如果我做第3步，填写所提供的单套
account属性的表单，然后提交，我得到一个“没有路由匹配[POST]“/转让/新”的错误。所以，很明显什么是错的我的路由选择。我不知道如何transfers和accounts应该出现在routes.rb中文件。作为resources :transfers resources :accounts或
resources :transfers do resources :accounts end或仍另一种方式。另外，我也不知道路由文件中是否需要
transfer_accounts。
如果你已经到了这一行，感谢您的耐心。>>）任何帮助，你可以提供将不胜感激。
干杯， 添