Ruby on rails 范围不为'；t接收数组作为参数

我在模型中定义了以下范围：

  scope :answers_in, -> (answers = nil) do
    return unless answers.present?
    where(answer_1: answers).or(where(answer_2: answers))
  end

应答

应该由一个数组进行。但是，当我通过数组进行调用时，收到一个参数错误：

AnswerConnection.answers_in([1, 2])
ArgumentError: wrong number of arguments (given 2, expected 0..1)
        from /vagrant/farma_alg_reborn/app/models/answer_connection.rb:7:in `block in <class:AnswerConnection>'
        from /usr/local/rvm/gems/ruby-2.3.1/gems/activerecord-5.0.1/lib/active_record/scoping/named.rb:159:in `instance_exec'
        from /usr/local/rvm/gems/ruby-2.3.1/gems/activerecord-5.0.1/lib/active_record/scoping/named.rb:159:in `block (2 levels) in scope'
        from /usr/local/rvm/gems/ruby-2.3.1/gems/activerecord-5.0.1/lib/active_record/relation.rb:351:in `scoping'
        from /usr/local/rvm/gems/ruby-2.3.1/gems/activerecord-5.0.1/lib/active_record/scoping/named.rb:159:in `block in scope'
        from (irb):2
        from /usr/local/rvm/gems/ruby-2.3.1/gems/railties-5.0.1/lib/rails/commands/console.rb:65:in `start'
        from /usr/local/rvm/gems/ruby-2.3.1/gems/railties-5.0.1/lib/rails/commands/console_helper.rb:9:in `start'
        from /usr/local/rvm/gems/ruby-2.3.1/gems/railties-5.0.1/lib/rails/commands/commands_tasks.rb:78:in `console'
        from /usr/local/rvm/gems/ruby-2.3.1/gems/railties-5.0.1/lib/rails/commands/commands_tasks.rb:49:in `run_command!'
        from /usr/local/rvm/gems/ruby-2.3.1/gems/railties-5.0.1/lib/rails/commands.rb:18:in `<top (required)>'
        from /usr/local/rvm/gems/ruby-2.3.1/gems/activesupport-5.0.1/lib/active_support/dependencies.rb:293:in `require'
        from /usr/local/rvm/gems/ruby-2.3.1/gems/activesupport-5.0.1/lib/active_support/dependencies.rb:293:in `block in require'
        from /usr/local/rvm/gems/ruby-2.3.1/gems/activesupport-5.0.1/lib/active_support/dependencies.rb:259:in `load_dependency'
        from /usr/local/rvm/gems/ruby-2.3.1/gems/activesupport-5.0.1/lib/active_support/dependencies.rb:293:in `require'
        from /vagrant/farma_alg_reborn/bin/rails:9:in `<top (required)>'
        from /usr/local/rvm/gems/ruby-2.3.1/gems/activesupport-5.0.1/lib/active_support/dependencies.rb:287:in `load'
        from /usr/local/rvm/gems/ruby-2.3.1/gems/activesupport-5.0.1/lib/active_support/dependencies.rb:287:in `block in load'
        from /usr/local/rvm/gems/ruby-2.3.1/gems/activesupport-5.0.1/lib/active_support/dependencies.rb:259:in `load_dependency'
        from /usr/local/rvm/gems/ruby-2.3.1/gems/activesupport-5.0.1/lib/active_support/dependencies.rb:287:in `load'
        from /usr/local/rvm/gems/ruby-2.3.1/gems/spring-2.0.0/lib/spring/commands/rails.rb:6:in `call'
        from /usr/local/rvm/gems/ruby-2.3.1/gems/spring-2.0.0/lib/spring/command_wrapper.rb:38:in `call'
        from /usr/local/rvm/gems/ruby-2.3.1/gems/spring-2.0.0/lib/spring/application.rb:191:in `block in serve'
        from /usr/local/rvm/gems/ruby-2.3.1/gems/spring-2.0.0/lib/spring/application.rb:161:in `fork'
        from /usr/local/rvm/gems/ruby-2.3.1/gems/spring-2.0.0/lib/spring/application.rb:161:in `serve'
        from /usr/local/rvm/gems/ruby-2.3.1/gems/spring-2.0.0/lib/spring/application.rb:131:in `block in run'
        from /usr/local/rvm/gems/ruby-2.3.1/gems/spring-2.0.0/lib/spring/application.rb:125:in `loop'
        from /usr/local/rvm/gems/ruby-2.3.1/gems/spring-2.0.0/lib/spring/application.rb:125:in `run'
        from /usr/local/rvm/gems/ruby-2.3.1/gems/spring-2.0.0/lib/spring/application/boot.rb:19:in `<top (required)>'
        from /usr/local/rvm/rubies/ruby-2.3.1/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
        from /usr/local/rvm/rubies/ruby-2.3.1/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
        from -e:1:in `<main>'

AnswerConnection.answers\u in（[1,2]）
ArgumentError:参数数目错误（给定2，应为0..1）
from/vagrant/farma_alg_reborn/app/models/answer_connection.rb:7:in'block in'
from/usr/local/rvm/gems/ruby-2.3.1/gems/activerecord-5.0.1/lib/active\u record/scoping/named.rb:159:in'instance\u exec'
from/usr/local/rvm/gems/ruby-2.3.1/gems/activerecord-5.0.1/lib/active\u record/scoping/named.rb:159:在“范围内的块（2个级别）”中
from/usr/local/rvm/gems/ruby-2.3.1/gems/activerecord-5.0.1/lib/active_record/relation.rb:351:在“范围”中
from/usr/local/rvm/gems/ruby-2.3.1/gems/activerecord-5.0.1/lib/active\u record/scoping/named.rb:159:在“范围内的块”中
来自（irb）：2
from/usr/local/rvm/gems/ruby-2.3.1/gems/railties-5.0.1/lib/rails/commands/console.rb:65:in'start'
来自/usr/local/rvm/gems/ruby-2.3.1/gems/railties-5.0.1/lib/rails/commands/console\u helper.rb:9:in'start'
from/usr/local/rvm/gems/ruby-2.3.1/gems/railties-5.0.1/lib/rails/commands/commands\u tasks.rb:78:在“控制台”中
from/usr/local/rvm/gems/ruby-2.3.1/gems/railties-5.0.1/lib/rails/commands/commands\u tasks.rb:49:in“run\u command！”
from/usr/local/rvm/gems/ruby-2.3.1/gems/railties-5.0.1/lib/rails/commands.rb:18:in`'
来自/usr/local/rvm/gems/ruby-2.3.1/gems/activesupport-5.0.1/lib/active\u support/dependencies.rb:293:in“require”
from/usr/local/rvm/gems/ruby-2.3.1/gems/activesupport-5.0.1/lib/active\u-support/dependencies.rb:293:in'block in require'
来自/usr/local/rvm/gems/ruby-2.3.1/gems/activesupport-5.0.1/lib/active\u support/dependencies.rb:259:in'load\u dependency'
来自/usr/local/rvm/gems/ruby-2.3.1/gems/activesupport-5.0.1/lib/active\u support/dependencies.rb:293:in“require”
from/vagrant/farma_alg_reborn/bin/rails:9:in`'
来自/usr/local/rvm/gems/ruby-2.3.1/gems/activesupport-5.0.1/lib/active\u support/dependencies.rb:287:in'load'
from/usr/local/rvm/gems/ruby-2.3.1/gems/activesupport-5.0.1/lib/active\u support/dependencies.rb:287:in'block in load'
来自/usr/local/rvm/gems/ruby-2.3.1/gems/activesupport-5.0.1/lib/active\u support/dependencies.rb:259:in'load\u dependency'
来自/usr/local/rvm/gems/ruby-2.3.1/gems/activesupport-5.0.1/lib/active\u support/dependencies.rb:287:in'load'
from/usr/local/rvm/gems/ruby-2.3.1/gems/spring-2.0.0/lib/spring/commands/rails.rb:6:in'call'
from/usr/local/rvm/gems/ruby-2.3.1/gems/spring-2.0.0/lib/spring/command_wrapper.rb:38:in'call'
from/usr/local/rvm/gems/ruby-2.3.1/gems/spring-2.0.0/lib/spring/application.rb:191:in'block in service'
from/usr/local/rvm/gems/ruby-2.3.1/gems/spring-2.0.0/lib/spring/application.rb:161:in'fork'
from/usr/local/rvm/gems/ruby-2.3.1/gems/spring-2.0.0/lib/spring/application.rb:161:in'serve'
from/usr/local/rvm/gems/ruby-2.3.1/gems/spring-2.0.0/lib/spring/application.rb:131:in'block in run'
from/usr/local/rvm/gems/ruby-2.3.1/gems/spring-2.0.0/lib/spring/application.rb:125:in'loop'
from/usr/local/rvm/gems/ruby-2.3.1/gems/spring-2.0.0/lib/spring/application.rb:125:in'run'
来自/usr/local/rvm/gems/ruby-2.3.1/gems/spring-2.0.0/lib/spring/application/boot.rb:19:in`'
from/usr/local/rvm/rubies/ruby-2.3.1/lib/ruby/2.3.0/rubygems/core\u ext/kernel\u require.rb:55:in'require'
from/usr/local/rvm/rubies/ruby-2.3.1/lib/ruby/2.3.0/rubygems/core\u ext/kernel\u require.rb:55:in'require'
from-e:1:in`'

---

这是一个bug，Rails作用域不能与数组一起工作，还是我做错了什么？

您必须在

或

方法中输入一个参数。试试这个：

where(user_1: answers).or(where(user_2: answers))

---

更新（ArgumentError:参数数量错误）

无法为作用域设置默认参数值：

scope :answers_in, -> (answers = nil) do

因此，将其替换为：

scope :answers_in, -> (answers) do

或者，如果希望参数是可选的，请按如下方式定义范围：

scope :answers_in, -> (*answers) do

---

但是，您必须将数组元素作为单独的参数传递

AnswerConnection.answers\u in（1,2）

而不是

AnswerConnection.answers\u in（[1,2]）

我更新了我的答案（并将

user\u x

更改为

answer\u x

，我意外切换）。这又给我返回了一个参数错误。哪一行是AnswerConnection模型中的第七行？（参考/vagrant/farma\u alg\u reborn/app/models/answer\u connection.rb:7:in block in'）是范围声明：

scope:answers\u in，->（answers=nil）do

那么，您确定只将一个answers数组传递到此方法吗？错误是，您试图在其中加入两个参数。你能告诉我，你是如何调用这个作用域的吗？是的，我通过了一个简单的数组，只是为了测试：

AnswerConnection.answers\u in（[1，2]）

。