6.3 add some debug info to the layouts, rails environment.
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<html> <body> <div class="container"> <%= render 'layouts/footer'%> <%= debug(params) if Rails.env.development? %> </div> </body></html>
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since we don't want to display the debug info to a deployed application, we use?
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if Rails.env.development?
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to restrict the debug info to dev environment.
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(rails console ? ---------------> this will start as dev environment)
(rails console test ? ---------------> this will start as test environment)
(rails console production ? ---------------> this will start as production environment)
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(rails server ? ?)
(rails server --environment product ? ? )
(rails server --environment test ? ?)
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(rake db:migrate RAILS_ENV=production ? ?)
(rake db:migrate RAILS_ENV=test)
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(it is confusing that the three command are using diff format to specify env, worth to remember it.)
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also, if you are using heroku, you can also start heroku console:
heroku console
Rails.env
====> "production"
Rails.env.production?
====> true
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