ruby on rails - Pagination not working with merged objects -

i have 4 objects

@ob1 = user.where(:area => "india") @ob2 = user.where(:area => "usa") @ob3 = user.where(:area => "uk") @ob4 = user.where(:area => "china") 

merged above 4 objects in on object

@merged_obj= @obj1+@obj2 

merged object , passing pagination

@users = @merged_obj.paginate(:page => params[:page], :per_page => 1) 

but troughs error

nomethoderror: undefined method `paginate' #<array:0x007fc3d65a5338> 

pagination works below code:

@users = user.where(:area => "india").paginate(:page => params[:page], :per_page => 1) 

gems:-

gem 'will_paginate', '~> 3.1.0' gem 'will_paginate-bootstrap' 

it looks won't work arrays. of following instead

@obj = user.where(:area => ["india","usa","uk","china"]) 

or

@merged_obj = user.where(id: [@ob1.id, @ob2.id, @ob3.id, @ob4.id]) 

edit: responding comments if denormalizing area not option own pagination on array

@page = @merged_obj[start, pagesize]