Set default value to true for existing Rails boolean column

If you have an existing boolean column in your Rails application and you want to set its default value to true, there are a few steps you can take to accomplish this task.

First, you need to generate a migration that adds a default value to the column. You can do this by running the following command in your terminal:

rails generate migration AddDefaultValueToColumnName

Replace "ColumnName" with the name of your boolean column.

Next, open the generated migration file and add the following code inside the `change` method:

change_column :table_name, :column_name, :boolean, default: true

Replace "table_name" with the name of the table where the column is located, and "column_name" with the name of your boolean column.

Save the migration file and run the migration by running the following command:

rails db:migrate

This will update the default value of the boolean column to "true" for all existing records in the database.

In conclusion, updating the default value of an existing Rails boolean column can be achieved by generating a migration, adding the default value to the column, and running the migration. By following these steps, you can easily set the default value of your boolean column to true.

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