[Rails] How to use enum

Introduction

I tried using enum instead of Active Hash in application development, so I summarized it lightly.

table of contents

  1. Table settings
  2. Model settings
  3. View file settings

1. Table settings

This time we will use enum for the column called gender. When using enum, the column type must be ** integer type **.

Column name Column type
gender integer

2. Model settings

Describe the data in the model file. The enum is defined in the form of a hash like the one below.

Example
enum gender: { man: 0, woman: 1, other: 2 }

3. View file settings

This time it was displayed as a radio button. Describe the column name in the first argument and the value defined in the model in the second argument.

<div class="field">
  <%= f.label :man %>
  <%= f.radio_button :gender, :man %>
  <%= f.label :woman %>
  <%= f.radio_button :gender, :woman %>
  <%= f.label :other %>
  <%= f.radio_button :gender, :other %>
</div>
Flow of saving to database when man is selected

Send man as key in view → Controller → Find number based on key sent in model → Save as numerical value in database

Reference link

https://madogiwa0124.hatenablog.com/entry/2017/12/24/222156

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