Scope doesn't receive array as argument

Question

I have the following scope defined in my model:

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

The answers should by an array. However, when I make a call passing an array, receive an argument error:

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>'

Is this a bug, Rails scopes doesn't work with arrays or I'm doing something wrong?

pan.goth · Accepted Answer · 2017-02-24 13:25:29Z

1

You have to put an argument into the or method. Try this:

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

UPDATE (ArgumentError: wrong number of arguments)

You can't set a default parameter value for scopes:

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

So, replace it with:

scope :answers_in, -> (answers) do

Or if you want the argument to be optional, define the scope like this:

scope :answers_in, -> (*answers) do

But then you have to pass array elements as separated arguments AnswerConnection.answers_in(1, 2) instead of AnswerConnection.answers_in([1, 2]).

edited Feb 24, 2017 at 13:25

answered Feb 23, 2017 at 16:28

pan.goth

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6 Comments

rwehresmann Over a year ago

I update my answer to this (and changed user_x to answer_x, I accidendally switched). That returns me an argument error again.

pan.goth Over a year ago

Which is the seventh line in your AnswerConnection model? (reffering to from /vagrant/farma_alg_reborn/app/models/answer_connection.rb:7:in block in <class:AnswerConnection>')

rwehresmann Over a year ago

It's the scope declaration: scope :answers_in, -> (answers = nil) do

pan.goth Over a year ago

So, are you sure, you're passing just an answers array into this method? The error says, you're trying to put two arguments into it. Could you show me, how are you calling this scope?

rwehresmann Over a year ago

Yes, I passed a simple array, just to test: AnswerConnection.answers_in([1, 2]).

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