I am teaching myself Ruby On Rails with Michael Hartl's Book. When it uncovered the use of seeds.rb file, I tested within Development Environment, it Failed. When set to Test Environment, It Succeeded. Why? When will I need to change the environment again for successful tests?
When To Use A Particular Rails Environment for Testing?
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When you say
I tested within Development Environment, it Failed., you are not running automated tests. You ran therake db:seedscript against the development database. The same task can be run against the test environment withrake db:seed RAILS_ENV=test. Again, this is not an automated test.There are many reasons why
rake db:seedrun against the development environment failed in your case. The specific reason could be identified based on the error message.developmentenvironment is one where you work on a day to day basis, adding/changing functionality by making code changes. By default, most scripts assume that you are working withdevelopmentenvironment.testenvironment is the environment against which the automated tests are run. In the case of rails tutorial, the automated tests are written in the files undertestfolder. When automated tests are run on a rails application - withrake testor some other way - thetestenvironment is used to run these tests against. Thetestdatabase gets cleaned up before running the tests to ensure the tests are run starting with a blank state.Hope this clarifies.