CODEWITHSUNDEEP
ruby-on-railsvalidationruby-on-rails-4model
Dipet
Dipet

Reputation: 323

validates() method in model usage

Just a quick question on the validates() method. When you're using it in the model, is there a way to write them to use the least amount of lines as possible?

Example say this is my model

class Items < ActiveRecord::Base
  validates :title, :price, presence: true
end

And say I want to add numericality to price and uniquness to title.

is there a way to write that on one line instead of doing

validate :title, uniqueness: true
validate :price, numericality: {greater_or_equal_to: 0.01}

Hopefully the question makes sense.

Upvotes: 1

Views: 99

Answers (1)

Stephen
Stephen

Reputation: 357

You can organize multiple attributes on one line that share the same validations

validates :foo, :bar, presence: true
validates :x, :y, numericality: { allow_blank: true }

This works really well for me. It's not unusual in my work to deal with tables with 20+ columns, reviewing all of those on one line of code would be a nightmare. You could write a custom validation method to try and put things on one line, but I don't think that's worth the effort. IE

validate :custom_method

Followed by:

def custom_method
errors.add(:foo, 'must have value') if self.foo.nil? ; errors.add(:bar, 'must have value') if self.bar.nil?
end

I hope that illustrates why accepting the extra line may be ok in the long run.

edit

Rails doesn't seem to complain if you were to do something like:

  validates :foo, length: { maximum: 12 }, presence: true ; validates :bar, length: { maximum: 40 }

Upvotes: 1

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