Question

The best solution I have right is like doing writing it like below.

Before release of production


if Category.count == 0
categories = Category.create([{ name: 'business' }, { name: 'sport' })
end


After

if Category.count == 0
  categories = Category.create([{ name: 'business' }, { name: 'sport' })
elsif Category.count == 2
  Category.create([{ name: 'science' }])
  categories = Category.all
end

This is kinda fail since I have to write [{ name: 'hoge' }] everytime I add a data.
And I might miss count the Category.count === COUNT which is in the elsif block.

Any better solution?

I think it’ll be nice if its able to add/remove some value from a certain Array to update the master data.

Answer 1

Use find_or_create with an array of data:

category_data = [
  { name: 'business' },
  { name: 'sport' }
]

category_data.each do |d|
  Category.find_or_create_by(d)
end

Edit: sorry, that was the syntax in Rails 4…

category_data.each do |d|
  Category.where(d).first_or_create()
end