rails generate migration array default value

To generate a migration in Ruby on Rails with an array default value, follow these steps:

1. Open your command line or terminal.
2. Navigate to your Rails application's root directory.
3. Run the following command to generate a new migration file: rails generate migration AddArrayDefaultValueToTableName array_column_name:string[]:default=>[] In the above command, replace AddArrayDefaultValueToTableName with the desired migration name and array_column_name with the name of the column that should have an array default value.
4. Open the generated migration file, located in the db/migrate directory, using a text editor.
5. Inside the change method, add the following code to set the default value for the array column: change_column_default :table_name, :array_column_name, ['default_value_1', 'default_value_2'] Replace table_name with the name of the table that contains the array column and array_column_name with the name of the array column. Also, replace ['default_value_1', 'default_value_2'] with the desired default values for the array column.
6. Save the migration file.
7. Run the migration by executing the following command: rails db:migrate This command will apply the changes to the database schema.

These steps will generate a migration file and set a default value for an array column in your Ruby on Rails application.