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Rails validation required numericality even though presence is not set to true

Posted by: admin November 30, 2017 Leave a comment

Questions:

I’m trying to save a record which doesn’t have one field set — which has a validate numericality in the models. Even though the presence is not required in the validation, it’s still throwing an error that the field is not a number.

Validation:

validates :network_id,    :numericality => true

Code to that is saving model:

networks.each do |network|
  network.url = network.raw_data.link
  network.save!
end

Error:

Validation failed: Network is not a number
Answers:
validates :network_id, :numericality => true, :allow_nil => true

Questions:
Answers:
    validates :network_id, :numericality => {:allow_blank => true}

Questions:
Answers:

You should use allow_blank

validates :network_id,    :numericality => true, :allow_blank => true

Questions:
Answers:

In Rails 4 (Ruby 2), you can write:

validates :network_id, numericality: { greater_than_or_equal_to: 0, allow_nil: true }