TAGS:

ruby  rails  migration  database  environment 

Related:

• Adding fields to table via migration.
• Creating migration file using generate migration
• Creation migration file using generate model.
• Creating migration file using scaffold.
• Drop tables using migration.
• Seeding data into tables via migration.
• Joining two tables via migration.
• Migration specific VERSION or STEP.
• Removing fields from tables via migration.
• Setting rails environment via migration command.
• Setup, reset and drop database

Setting Environment For Rails Migration.

You can set the environment for rails migration RAILS_ENV using one of two ways:

First, Using rake command line as:

rake db:migrate RAILS_ENV=test
#or
rake db:migrate RAILS_ENV=development
#or
rake db:migrate RAILS_ENV=production

Second, Using system variables in command line

export RAILS_ENV=test
#or
export RAILS_ENV=development
#or
export RAILS_ENV=production

Or editing ~/.bashrc file to add RAILS_ENV as:

echo 'RAILS_ENV=test' >> ~/.bashrc
#or
echo 'RAILS_ENV=test' >> ~/.bashrc
#or
echo 'RAILS_ENV=test' >> ~/.bashrc

And then, refresh your system variables using:

source ~/.bashrc

You can assure that you have system variable RAILS_ENV and its value using :

echo $RAILS_ENV

Note, The database for that environment must be created before its migration.

Now, Take a look to this tutorial video: