will_paginate-bootstrap | Integrates the Twitter Bootstrap pagination component

In my rails app when user creates a post, mail sent to the user who creates the post. I have tried "delayed_job_active_record" gem for background mailing operation. Mail sends successfully. After that, I am just trying to do same action using sidekiq via letter opener. Event happens and also letter opener shows the mail content. After that, instead of letter opener use google smtp settings. Even, sidekiq opens the letter opener without sending emails. So, I uninstall the letter opener. But that causes an error like this

No such file or directory letter opener

This is my Posts_controller:::

I had a working pagination but after some changes to the gemfile, all the pagination started throwing this error wrong number of arguments (given 0, expected 1)

The gemfile changes have brought the errors on every class that needs pagination so it could be an issue about how I am handling the gem. The error is here Showing /home/ec2-user/environment/homework_helper/app/views/assignments/assignment/_homework_answers_page.html.erb where line #3 raised:

In a rails application, I am creating a has_many associations between Team and players, from console I can save the data but from the browser I am not able to save the data. The values are rolling back and showing head no content error in the log.

It is clear that there is a mistake in passing the value from new.html.erb to PlayersContoller. I don't have any validation in player model. I am a beginner, every suggestion is a gem, please help me with valuable guidance

//routes.rb

In my rails app I am priting receipt using cups with gem cupsffi

This is the job I have set:

I am trying to update a Rails app from Rails 5.2.0.rc2 to Rails 5.2.2

So far, I:

• Deleted gemfile.lock
• Removed version numbers from most gems in the gem file
• Upgraded version to 5.2.2 for the rails gem in the gem file

When I run bundle update or bundle install, I get this error:

this is my first time working with sass files, its been relatively cool until i tried to deploy to heroku,i keep getting this error from my log on heroku, assets:precompile works perfectly in development but each time i try to deploy,it fails, am running on Rails 5 below is my error log

Error log

I'm trying to install this gem in rails app: https://github.com/collectiveidea/delayed_job

As instructed, I added this to my gem file, and ran bundle install:

I Have 4 objects

Current code is showing results in random order but I want to display USA list first in order to India, UK and China.