范围不接受数组作为参数

我在我的模型中定义的范围如下：范围不接受数组作为参数

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

的answers应该由数组。然而，当我拨打电话传递一个阵列，接收参数错误：

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>'

这是一个错误，Rails的范围不使用数组或我做错了什么？

来源

2017-02-23 rwehresmann

您必须将参数放入or方法中。试试这个：

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

UPDATE（引发ArgumentError：错误的参数数目）

不能设置范围默认参数值：

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

所以，更换它与：

scope :answers_in, -> (answers) do

或者，如果你想要的参数是可选的，这样定义范围：

scope :answers_in, -> (*answers) do

但你必须通过数组元素作为单独的参数AnswerConnection.answers_in(1, 2)代替AnswerConnection.answers_in([1, 2])。

来源

2017-02-23 16:28:15

我更新我的答案（并将'user_x'更改为'answer_x'，我偶然切换）。这又给我一个参数错误。 – rwehresmann

哪一个是你的AnswerConnection模型中的第七行？（在'中的block中回答'from /vagrant/farma_alg_reborn/app/models/answer_connection.rb:7'） –

这是范围声明：'scope：answers_in， - >（answers = nil） ' – rwehresmann

范围不接受数组作为参数

回答

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