Initial data input with [Rails] seed_fu!

What is seed_fu

seed-fu is a syntax that already exists but you can update only the records you want to change, execute it on a file-by-file basis, and write it easily. It is a convenient gem with sugar.

How to use

1. Describe the following in the Gemfile.

gem 'seed-fu'

Also execute this.

$ bundle install

2. Create a directory to put the seed file.

• Seed files under db / fixture are read in alphabetical order. If you need to specify the reading order, put a number at the beginning of the file name.

#Must-have directory
db/fixtures

#Create different data for each environment
db/fixtures/development
db/fixtures/production

3. Create a seed file in db / fixtures below.

01_category.rb

Category.seed do |c|
  c.id = 1
  c.name = 'HTML'
end

Category.seed do |c|
  c.id = 2
  c.name = 'CSS'
end

Category.seed do |c|
  c.id = 3
  c.name = 'Ruby'
end

4. Execute the seed_fu command.

$ rails db:seed_fu

Tips

Use seed_once

Use seed_once if you don't want to update the data once it's created.

Category.seed_once do |s|
  s.id = 1
  s.name = 'HTML'
end

Syntax sugar

When creating a seed file, you can write as follows in addition to the above description.

Category.seed(:id,
 { id: 1, name: 'HTML' },
 { id: 2, name: 'CSS' },
 { id: 3, name: 'Ruby' },
)

Create data from CSV file

• Separate the elements with commas. (Here, id, name in that order)

db/fixtures/development/category.csv

1,HTML
2,CSS
3,Ruby

Write the process to read from CSV.

db/fixtures/development/01_category.rb

require 'csv'

csv = CSV.read('db/fixtures/development/category.csv')
csv.each do |category|
 Category.seed do |s|
  s.id = category[0] #Here id
  s.name = category[1] #Here name
 end
end

Finally execute the following command

$ rails db:seed_fu

User created

Since the password is not set properly in seed_fu, use the default seed.

db/fixtures/development/00_user.rb

User.create!(id: 1, name: 'yuh', email: '[email protected]',
password: 'password', password_confirmation: 'password')