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The following link's sections labeled 'Anatomy of a Migration' and 'Writing a Migration' might be of help to you. Basically rather than edit the original migration files generated when you run scaffolding you create a new migration file just for what you want to acheive: and then I loaded my page/controller with commenter_body instead of body and it loaded perfectly. I dont know if there is any issue in the underneath workings in the model/DB( i am still very new to Ro R,my third day actually...) before you add any schema-defining statements to the file, the database will think it has been updated, and the schema info table will contain the new version number.
If you then edit that existing migration file and run Once u do rake db:migrate then again u cannot add column to that file.
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Nokogiri is a gem that is a dependency for many other gems (specifically, the rails-html-sanitizer gem and its dependency, the loofah gem).
I'm trying to add an extra field to one of my tables.
C:/Bitnami/redmine-2.5.1-1/apps/redmine/htdocs/config/boot.rb:8:in `rake redmine:plugins:migrate RAILS_ENV=production Migrating redmine_issue_templates (Redmine Issue Templates plugin)...If you neglect to update regularly, upgrading several versions at once may require considerable effort, making it difficult to resolve security vulnerabilities quickly.If you don’t update Rails, you leave your application and its server open to attack.You have to generate a new migration file by using rails g migration add_columnname_to_tablename for adding that particular column and do rake db:migrate. Upgrading to Rails 5.0, the newest Ruby on Rails version.