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使用多个关系时的rom rb表单验证

rom-rb ruby-object-mapper ruby

Xavier Shay · 技术社区 · 9 年前

我正在尝试 http://rom-rb.org/ 并且无法确定如何在存在多个源模型的情况下通过状态验证。我希望下面的脚本可以保存一个新的活动和组织者,但它说 event_name 不存在。

我错过了什么?

require 'bundler/inline'

gemfile do
  source 'https://rubygems.org'
  gem 'rom'
  gem 'rom-sql'
  gem 'rom-rails'
  gem 'activemodel'
  gem 'sqlite3'
  gem 'activesupport'
end

require 'rom'
require 'rom-rails'

`rm -Rf /tmp/romtest.sqlite`
ROM.setup(:sql, 'sqlite:///tmp/romtest.sqlite')

class Events < ROM::Relation[:sql]
end

class Organisers < ROM::Relation[:sql]
end

class CreateEvent < ROM::Commands::Create[:sql]
  relation :events
  register_as :create
  result :one

  associates :organiser, key: [:organiser_id, :id]
end

class CreateOrganiser < ROM::Commands::Create[:sql]
  relation :organisers
  register_as :create
  result :one
end

class CreateEventWithOrganiser < ROM::Model::Form
  commands organisers: :create, events: :create

  input do
    attribute :email
    attribute :event_name
  end

  validations do
    validates :event_name, presence: true
  end

  def commit!
    command = organisers.create.with(
      email: email,
    ) >> events.create.with(
      name: event_name,
    )

    command.transaction do
      command.call
    end
  end
end

ROM.finalize
rom = ROM.env
gateway = rom.gateways.fetch(:default)
migration = gateway.migration do
  change do
    create_table :organisers do
      primary_key :id
      column :email, String, null: false
    end

    create_table :events do
      primary_key :id
      column :name, String, null: false
      column :organiser_id, Integer, null: false
    end
  end
end

migration.apply(gateway.connection, :up)

f = CreateEventWithOrganiser.build(
  email:      'test@example.com',
  event_name: 'Test Event'
)

# Unexpectedly fails
f.save
puts f.errors.full_messages
# => "Event name can't be blank"

1 回复 | 直到 9 年前

solnic 9 年前

这是您的脚本的更新版本,它可以工作:

require 'rom'
require 'rom-rails'

`rm -Rf /tmp/romtest.sqlite`
ROM.setup(:sql, 'sqlite:///tmp/romtest.sqlite')

class Events < ROM::Relation[:sql]
end

class Organisers < ROM::Relation[:sql]
end

class CreateEvent < ROM::Commands::Create[:sql]
  relation :events
  register_as :create
  result :one

  associates :organiser, key: [:organiser_id, :id]
end

class CreateOrganiser < ROM::Commands::Create[:sql]
  relation :organisers
  register_as :create
  result :one
end

class CreateEventWithOrganiser < ROM::Model::Form
  inject_commands_for :organisers, :events

  input do
    attribute :email
    attribute :event_name
  end

  validations do
    validates :event_name, presence: true
  end

  def commit!
    validate!

    return if errors.any?

    command = organisers.create.with(
      email: email
    ) >> events.create.with(
      name: event_name
    )

    command.transaction do
      command.call
    end
  end
end

ROM.finalize
rom = ROM.env
gateway = rom.gateways.fetch(:default)
migration = gateway.migration do
  change do
    create_table :organisers do
      primary_key :id
      column :email, String, null: false
    end

    create_table :events do
      primary_key :id
      column :name, String, null: false
      column :organiser_id, Integer, null: false
    end
  end
end

migration.apply(gateway.connection, :up)

f = CreateEventWithOrganiser.build(
  email:      'test@example.com',
  event_name: 'Test Event'
)

puts f.save.result.inspect
# #<ROM::Commands::Result::Success:0x007fa92b589ea0 @value={:id=>1, :name=>"Test Event", :organiser_id=>1}>

它不起作用的原因 commands 这是因为此方法将为表单生成命令对象,并为每个命令设置提供的验证,只有在使用单个命令时才能正常工作。否则,每个命令都使用相同的验证器,这是不合理的。当您使用 inject_commands_for 它将在没有设置验证器的地方抓取您自己的命令,这样您就可以自己处理验证。

我认为我们应该停止在命令上设置验证器,这会使您的原始示例工作,但请注意,您需要调用 validate! 你自己

我希望这有帮助。

我还创建了一个要点,展示了如何在没有表单的情况下执行相同操作: https://gist.github.com/solnic/3b68342482cf1414f719