Pagination in RoR is not working - ruby-on-rails

Question

I am working on a small ruby-on-rails program and stumbled upon on a pagination problem. After installing gems for pagination:
gem 'will_paginate', '3.0.7'
gem 'bootstrap-will_paginate', '0.0.10'
I changed the controller class to this:
def index
#allArticles = Article.paginate(page: params[:page], per_page: 5)
end
And changed the html.erb file to this:
<div align="center">
<%= will_paginate %>
</div>
<%= render 'article', obj: #allArticles %>
<div align="center">
<%= will_paginate %>
</div>
When I run the server locally it gives me this problem:
=> Booting Puma
=> Rails 5.0.0 application starting in development on http://localhost:3000
=> Run `rails server -h` for more startup options
Exiting
/home/inson/.rvm/gems/ruby-2.3.0/gems/activesupport-5.0.0/lib/active_support/i18n_railtie.rb:45:in `map': undefined method `existent' for #<String:0x00000004c89818> (NoMethodError)
Did you mean? extend
from /home/inson/.rvm/gems/ruby-2.3.0/gems/activesupport-5.0.0/lib/active_support/i18n_railtie.rb:45:in `block in initialize_i18n'
from /home/inson/.rvm/gems/ruby-2.3.0/gems/activesupport-5.0.0/lib/active_support/i18n_railtie.rb:41:in `each'
from /home/inson/.rvm/gems/ruby-2.3.0/gems/activesupport-5.0.0/lib/active_support/i18n_railtie.rb:41:in `initialize_i18n'
from /home/inson/.rvm/gems/ruby-2.3.0/gems/activesupport-5.0.0/lib/active_support/i18n_railtie.rb:15:in `block in <class:Railtie>'
from /home/inson/.rvm/gems/ruby-2.3.0/gems/activesupport-5.0.0/lib/active_support/lazy_load_hooks.rb:36:in `execute_hook'
from /home/inson/.rvm/gems/ruby-2.3.0/gems/activesupport-5.0.0/lib/active_support/lazy_load_hooks.rb:45:in `block in run_load_hooks'
from /home/inson/.rvm/gems/ruby-2.3.0/gems/activesupport-5.0.0/lib/active_support/lazy_load_hooks.rb:44:in `each'
from /home/inson/.rvm/gems/ruby-2.3.0/gems/activesupport-5.0.0/lib/active_support/lazy_load_hooks.rb:44:in `run_load_hooks'
from /home/inson/.rvm/gems/ruby-2.3.0/gems/railties-5.0.0/lib/rails/application/finisher.rb:65:in `block in <module:Finisher>'
from /home/inson/.rvm/gems/ruby-2.3.0/gems/railties-5.0.0/lib/rails/initializable.rb:30:in `instance_exec'
from /home/inson/.rvm/gems/ruby-2.3.0/gems/railties-5.0.0/lib/rails/initializable.rb:30:in `run'
from /home/inson/.rvm/gems/ruby-2.3.0/gems/railties-5.0.0/lib/rails/initializable.rb:55:in `block in run_initializers'
from /home/inson/.rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/tsort.rb:228:in `block in tsort_each'
from /home/inson/.rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/tsort.rb:350:in `block (2 levels) in each_strongly_connected_component'
from /home/inson/.rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/tsort.rb:431:in `each_strongly_connected_component_from'
from /home/inson/.rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/tsort.rb:349:in `block in each_strongly_connected_component'
from /home/inson/.rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/tsort.rb:347:in `each'
from /home/inson/.rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/tsort.rb:347:in `call'
from /home/inson/.rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/tsort.rb:347:in `each_strongly_connected_component'
from /home/inson/.rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/tsort.rb:226:in `tsort_each'
from /home/inson/.rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/tsort.rb:205:in `tsort_each'
from /home/inson/.rvm/gems/ruby-2.3.0/gems/railties-5.0.0/lib/rails/initializable.rb:54:in `run_initializers'
from /home/inson/.rvm/gems/ruby-2.3.0/gems/railties-5.0.0/lib/rails/application.rb:352:in `initialize!'
from /home/inson/Desktop/Ruby/code/rails-projects/alpha-blog/config/environment.rb:5:in `<top (required)>'
from /home/inson/Desktop/Ruby/code/rails-projects/alpha-blog/config.ru:3:in `require_relative'
from /home/inson/Desktop/Ruby/code/rails-projects/alpha-blog/config.ru:3:in `block in <main>'
from /home/inson/.rvm/gems/ruby-2.3.0/gems/rack-2.0.1/lib/rack/builder.rb:55:in `instance_eval'
from /home/inson/.rvm/gems/ruby-2.3.0/gems/rack-2.0.1/lib/rack/builder.rb:55:in `initialize'
from /home/inson/Desktop/Ruby/code/rails-projects/alpha-blog/config.ru:in `new'
from /home/inson/Desktop/Ruby/code/rails-projects/alpha-blog/config.ru:in `<main>'
from /home/inson/.rvm/gems/ruby-2.3.0/gems/rack-2.0.1/lib/rack/builder.rb:49:in `eval'
from /home/inson/.rvm/gems/ruby-2.3.0/gems/rack-2.0.1/lib/rack/builder.rb:49:in `new_from_string'
from /home/inson/.rvm/gems/ruby-2.3.0/gems/rack-2.0.1/lib/rack/builder.rb:40:in `parse_file'
from /home/inson/.rvm/gems/ruby-2.3.0/gems/rack-2.0.1/lib/rack/server.rb:318:in `build_app_and_options_from_config'
from /home/inson/.rvm/gems/ruby-2.3.0/gems/rack-2.0.1/lib/rack/server.rb:218:in `app'
from /home/inson/.rvm/gems/ruby-2.3.0/gems/railties-5.0.0/lib/rails/commands/server.rb:59:in `app'
from /home/inson/.rvm/gems/ruby-2.3.0/gems/rack-2.0.1/lib/rack/server.rb:353:in `wrapped_app'
from /home/inson/.rvm/gems/ruby-2.3.0/gems/railties-5.0.0/lib/rails/commands/server.rb:124:in `log_to_stdout'
from /home/inson/.rvm/gems/ruby-2.3.0/gems/railties-5.0.0/lib/rails/commands/server.rb:77:in `start'
from /home/inson/.rvm/gems/ruby-2.3.0/gems/railties-5.0.0/lib/rails/commands/commands_tasks.rb:90:in `block in server'
from /home/inson/.rvm/gems/ruby-2.3.0/gems/railties-5.0.0/lib/rails/commands/commands_tasks.rb:85:in `tap'
from /home/inson/.rvm/gems/ruby-2.3.0/gems/railties-5.0.0/lib/rails/commands/commands_tasks.rb:85:in `server'
from /home/inson/.rvm/gems/ruby-2.3.0/gems/railties-5.0.0/lib/rails/commands/commands_tasks.rb:49:in `run_command!'
from /home/inson/.rvm/gems/ruby-2.3.0/gems/railties-5.0.0/lib/rails/commands.rb:18:in `<top (required)>'
from /home/inson/Desktop/Ruby/code/rails-projects/alpha-blog/bin/rails:9:in `require'
from /home/inson/Desktop/Ruby/code/rails-projects/alpha-blog/bin/rails:9:in `<top (required)>'
from /home/inson/.rvm/gems/ruby-2.3.0/gems/spring-1.7.2/lib/spring/client/rails.rb:28:in `load'
from /home/inson/.rvm/gems/ruby-2.3.0/gems/spring-1.7.2/lib/spring/client/rails.rb:28:in `call'
from /home/inson/.rvm/gems/ruby-2.3.0/gems/spring-1.7.2/lib/spring/client/command.rb:7:in `call'
from /home/inson/.rvm/gems/ruby-2.3.0/gems/spring-1.7.2/lib/spring/client.rb:30:in `run'
from /home/inson/.rvm/gems/ruby-2.3.0/gems/spring-1.7.2/bin/spring:49:in `<top (required)>'
from /home/inson/.rvm/gems/ruby-2.3.0/gems/spring-1.7.2/lib/spring/binstub.rb:11:in `load'
from /home/inson/.rvm/gems/ruby-2.3.0/gems/spring-1.7.2/lib/spring/binstub.rb:11:in `<top (required)>'
from /home/inson/Desktop/Ruby/code/rails-projects/alpha-blog/bin/spring:13:in `require'
from /home/inson/Desktop/Ruby/code/rails-projects/alpha-blog/bin/spring:13:in `<top (required)>'
from bin/rails:3:in `load'
from bin/rails:3:in `<main>'
I don`t know why it gives me a problem.

Answer 1

I was using the same plugin for a small API I was developing. Here's a small snippet on how I used will-paginate
# GET /posts
def index #posts = paginate Post.all, per_page: 10
render :json => {
:data => #posts,
:success => true
}
end
You can change global parameters in your configuration file. Or you can explicitly set certain parameters like I did when populating the variable.
Hope it helps!