Rails field addition, deletion, and modification commands

1. In fact, every time the rails C Console reads files in the model, they will not be updated automatically. Therefore, when adding fields, you must first write the fields in the model file, then restart rails C to find this field.

2. Add a field: rails g migration add_column_to_model field name: Type

Then, the Migration task will not succeed if you want to add fields to the model. The migration file already exists, so you can only delete fields.

The rails g migrationk remove_column_from_model field name is to delete the previous migration file.

Add two fields again to execute the migration task.

Rails field addition, deletion, and modification commands