Check out example codes for "how to add column to table rails". It will help you in understanding the concepts better.
Code Example 1
rails g migration add_description_to_users description:string #'g' means generate, the 'add' in 'add_description_to_users' tells #Rails you want to add a column, the 'description' is the new column name, #and the 'users' is the table you want to add it to, must be plural. #After you've checked your migration to make sure its what you want... rails db:migrate
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