rails g model Overall flow

When the environment construction is completed to some extent and it is reflected in the application development, first create the model and table. Here is a brief summary of the basics of creating a model.

Basic flow

① Create model

rails g model [model name] column1: data type, column2: data type, ...

• Model name is table singular system
• One-to-one model and table
• If you specify the references type, you can set the association. ex. rails g model [model name] [references]: * references *
• When you execute the rails g model command, the following 4 files are automatically generated. Of these, 1 and 2 will appear this time, so keep them in check.

1.Model class file(/app/models/[Model name].rb)
2.Migration file(/db/migrate/yyyyMMddxxxx_create_[table name])
3.Automatic model testing
4.Ficture file used for automatic model testing

② Create / update table

Execute the rails db: migrate command

③ Refer to the table and check if it is created without any problem.

Main points to note in the above flow

① About foreign key constraints

When the references type is set in the foreign key column when executing the rails g model command

There is the following description, so correct it (add)

/db/migrate/yyyyMMddxxxx_create_[table name]

t.references :[Own table name singular]`

↓

/db/migrate/yyyyMMddxxxx_create_[table name]

`t.references :[Own table name singular], foreign_key:true`

Create / update table

If you want to add and set foreign keys for each column later

rails g migration [class name] [reference class name]: references, ... execute the command

• [Class name] should be in the form of AddXXXRefsToYYY. XXX: Reference class YYY: Reference class
• By the way, if you specify string etc. for the data type, you can add a normal column.

Create / update table