範圍不接受數組作爲參數

我在我的模型中定義的範圍如下：範圍不接受數組作爲參數

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

的answers應該由數組。然而，當我撥打電話傳遞一個陣列，接收參數錯誤：

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>'

這是一個錯誤，Rails的範圍不使用數組或我做錯了什麼？

來源

2017-02-23 rwehresmann

您必須將參數放入or方法中。試試這個：

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

UPDATE（引發ArgumentError：錯誤的參數數目）

不能設置範圍默認參數值：

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

所以，更換它與：

scope :answers_in, -> (answers) do

或者，如果你想要的參數是可選的，這樣定義範圍：

scope :answers_in, -> (*answers) do

但你必須通過數組元素作爲單獨的參數AnswerConnection.answers_in(1, 2)代替AnswerConnection.answers_in([1, 2])。

來源

2017-02-23 16:28:15

我更新我的答案（並將'user_x'更改爲'answer_x'，我偶然切換）。這又給我一個參數錯誤。 – rwehresmann

哪一個是你的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'） –

這是範圍聲明：'scope：answers_in， - >（answers = nil） ' – rwehresmann

範圍不接受數組作爲參數

回答

相關問題