Ruby on Rails ActiveRecord Migrations Remove an existing column from a table
Example
To remove existing column name from users table, run the command:
rails generate migration RemoveNameFromUsers name:string
This will generate the following migration:
class RemoveNameFromUsers < ActiveRecord::Migration[5.0]
def change
remove_column :users, :name, :string
end
end
When the migration name is of the form RemoveXXXFromYYY followed by list of columns with data types then the generated migration will contain the appropriate remove_column statements.
While it’s not required to specify the data type (e.g. :string) as a parameter to remove_column, it is highly recommended. If the data type is not specified, then the migration will not be reversible.
