Fixed returned value of Ransack::Nodes::Condition#format_predicate

[camelmasa]

I tried to change spec/support/schema.rb and spec/ransack/adapters/active_record/base_spec.rb like below.

# spec/support/schema.rb:69
ransacker :array_users,                                                                                                
  formatter: proc { |v| Person.where(id: v).map(&:id) } do |parent|                                                    
  parent.table[:id]                                                                                                    
end   

# spec/ransack/adapters/active_record/base_spec.rb:316
it 'should function correctly when passing an array of ids' do                                                           
  s = Person.ransack(array_users_in: [1, 2])                                                                               
  expect(s.result.count).to be 2
end

Should be pass tests but that couldn't pass tests.

Because, Ransack::Nodes::Condition#format_predicate method can target predicate.right[0] only.
I think the method should target several predicate.right.

[camelmasa]

@jonatack Could you review when you have chance ❓

I want to add some informations if that was not enough. Thanks.

[jonatack]

Thank you @camelmasa, tested it, LGTM.
❤️ 💚 💙 💛 💜

[jonatack]

Feel free to add a change log PR.

[camelmasa]

@jonatack Thank you very much for merged this PR 🤗

Yeah, I'm going to add change log next week 👍