Question

我计划使用此模块（此处为完整示例http://pastie.org/1098444）

puts "Name_and_key was referenced."

module Name_and_key

  def normalize(s)
    s.mb_chars.normalize(:kd).gsub(/[^\-x00-\x7F]/n, '').to_s
  end

  def name=(name)
    self[:name] = name
    self[:key] = normalize(name).downcase
  end

  def name
    self[:name]
  end

  def key=(key)
    self[:key] = normalize(key).downcase
  end

  def key
    self[:key]
  end

end

但似乎这些值没有到达模型。

 class Category < ActiveRecord::Base
  include Name_and_key

  has_many :tiles
  validates_presence_of :name, :key
end

和

cat = Category.create do |c|
 c.name = "cat"
end

ActiveRecord :: StatementInvalid：SQLite3 :: ConstraintException：categories.name可能不为NULL：INSERT INTO“categories”（“created_at”，“updated_at”，“id”）VALUES（'2010-08-15 23:20 ：43'，'2010-08-15 23:20:43'，980190962）

这是否是一种有效的方法，如果不是这样做怎么办？如果确实，我的错误是什么？

单元测试失败

test "can be created" do
cat = Category.create do |c|
  c.name = "cat"
end
tile = Tile.create do |t|
  t.name = "test"
  t.category = cat
end
assert tile.save

端

一些痕迹

  1) Error:

test_can_be_created（TileTest）： ActiveRecord :: StatementInvalid：SQLite3 :: ConstraintException：categories.name可能不为NULL：INSERT INTO“categories”（“created_at”，“updated_at”，“id”）VALUES（'2010-08-16 02:06:43' ，'2010-08-16 02:06:43'，980190962） /Users/janlimpens/.rvm/gems/ruby-1.9.2-rc2@rails3/gems/activerecord-3.0.0.rc/lib/active_record/connection_adapters/abstract_adapter.rb:202:in rescue in log' /Users/janlimpens/.rvm/gems/ruby-1.9.2-rc2@rails3/gems/activerecord-3.0.0.rc/lib/active_record/connection_adapters/abstract_adapter.rb:194:in log' /Users/janlimpens/.rvm/gems/ruby-1.9.2-rc2@rails3/gems/activerecord-3.0.0.rc/lib/active_record/connection_adapters/sqlite_adapter.rb:135:in execute' /Users/janlimpens/.rvm/gems/ruby-1.9.2-rc2@rails3/gems/activerecord-3.0.0.rc/lib/active_record/connection_adapters/abstract/database_statements.rb:239:in insert_fixture' /Users/janlimpens/.rvm/gems/ruby-1.9.2-rc2@rails3/gems/activerecord-3.0.0.rc/lib/active_record/fixtures.rb:634:in block in insert_fixtures' /Users/janlimpens/.rvm/gems/ruby-1.9.2-rc2@rails3/gems/activerecord-3.0.0.rc/lib/active_record/fixtures.rb:570:in each' /Users/janlimpens/.rvm/gems/ruby-1.9.2-rc2@rails3/gems/activerecord-3.0.0.rc/lib/active_record/fixtures.rb:570:in insert_fixtures' /Users/janlimpens/.rvm/gems/ruby-1.9.2-rc2@rails3/gems/activerecord-3.0.0.rc/lib/active_record/fixtures.rb:514:in块（4个级别））在create_fixtures'中 /Users/janlimpens/.rvm/gems/ruby-1.9.2-rc2@rails3/gems/activerecord-3.0.0.rc/lib/active_record/fixtures.rb:514:in each' /Users/janlimpens/.rvm/gems/ruby-1.9.2-rc2@rails3/gems/activerecord-3.0.0.rc/lib/active_record/fixtures.rb:514:in块（3个级别））在create_fixtures'中 /Users/janlimpens/.rvm/gems/ruby-1.9.2-rc2@rails3/gems/activerecord-3.0.0.rc/lib/active_record/connection_adapters/abstract/database_statements.rb:139:in transaction' /Users/janlimpens/.rvm/gems/ruby-1.9.2-rc2@rails3/gems/activerecord-3.0.0.rc/lib/active_record/fixtures.rb:512:in在create_fixtures中阻止（2个级别） /Users/janlimpens/.rvm/gems/ruby-1.9.2-rc2@rails3/gems/activerecord-3.0.0.rc/lib/active_record/connection_adapters/abstract_adapter.rb:104:in disable_referential_integrity' /Users/janlimpens/.rvm/gems/ruby-1.9.2-rc2@rails3/gems/activerecord-3.0.0.rc/lib/active_record/fixtures.rb:503:in阻止create_fixtures' /Users/janlimpens/.rvm/gems/ruby-1.9.2-rc2@rails3/gems/activesupport-3.0.0.rc/lib/active_support/benchmarkable.rb:55:in silence' /Users/janlimpens/.rvm/gems/ruby-1.9.2-rc2@rails3/gems/activerecord-3.0.0.rc/lib/active_record/fixtures.rb:502:in create_fixtures' /Users/janlimpens/.rvm/gems/ruby-1.9.2-rc2@rails3/gems/activerecord-3.0.0.rc/lib/active_record/fixtures.rb:961:in load_fixtures' /Users/janlimpens/.rvm/gems/ruby-1.9.2-rc2@rails3/gems/activerecord-3.0.0.rc/lib/active_record/fixtures.rb:926:in setup_fixtures' /Users/janlimpens/.rvm/gems/ruby-1.9.2-rc2@rails3/gems/activesupport-3.0.0.rc/lib/active_support/callbacks.rb:409:in _run_setup_callbacks' /Users/janlimpens/.rvm/gems/ruby-1.9.2-rc2@rails3/gems/activesupport-3.0.0.rc/lib/active_support/testing/setup_and_teardown.rb:34:in run'

Answer 1

我建议添加validates_presence_of :name来捕获ruby端的错误。您的应用尝试将看似有效的对象保存到数据库，名称为NULL，ruby端允许。现在你的数据库爆炸了，因为你在那里设置了一个NOT NULL，这与你在那里保存的不一样。

将公共属性注入activerecord类的正确方法是什么？

1 个答案: