Model and table creation

Keep a memorandum of model and table creation.

Create a model in the terminal

rails g model model name

OK if the following log appears

      invoke  active_record
      create    db/migrate/000000000_create_tweets.rb
      create    app/models/Model name.rb
      invoke    test_unit
      create      test/models/Model name_test.rb
      create      test/fixtures/Model name.yml

Model name.rb is created.

Creating a table

A migration file is created when the model is generated. Located in the migrate file in the db folder. Edit this.

class Create model name (uppercase)< ActiveRecord::Migration[6.0]
  def change
    create_table :Model name do|t|
      t.string :name
      t.string :text
      t.text :image
      t.timestamps
    end
  end
end

t. The "type" is followed by the "column name".

Type of type

string: string text: long string integer: integer float: floating point decimal: Decimal with high precision datetime: date and time timestamp: timestamp time: time date: date binary: binary data boolean : Boolean

Perform migration

rails db:migrate

OK if the following log appears

== 20xxxxxxxxxx CreateTweets: migrating =====================================
-- create_table(:tweets)
   -> 0.0148s
== 20xxxxxxxxxx CreateTweets: migrated (0.0149s) ============================

Finally, restart the local server with rails s, and if you can confirm that the data is saved with rails c, you're done