Flowdock
method

validates_presence_of

Importance_2
validates_presence_of(*attr_names) public

Validates that the specified attributes are not blank (as defined by Object#blank?). Happens by default on save. Example:

  class Person < ActiveRecord::Base
    validates_presence_of :first_name
  end

The first_name attribute must be in the object and it cannot be blank.

If you want to validate the presence of a boolean field (where the real values are true and false), you will want to use validates_inclusion_of :field_name, :in =&gt; [true, false].

This is due to the way Object#blank? handles boolean values: false.blank? # =&gt; true.

Configuration options:

  • message - A custom error message (default is: "can’t be blank").
  • on - Specifies when this validation is active (default is :save, other options :create, :update).
  • if - Specifies a method, proc or string to call to determine if the validation should occur (e.g. :if =&gt; :allow_validation, or :if =&gt; Proc.new { |user| user.signup_step &gt; 2 }). The method, proc or string should return or evaluate to a true or false value.
  • unless - Specifies a method, proc or string to call to determine if the validation should not occur (e.g. :unless =&gt; :skip_validation, or :unless =&gt; Proc.new { |user| user.signup_step &lt;= 2 }). The method, proc or string should return or evaluate to a true or false value.
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April 27, 2013 - (v3.1.0 - v3.2.13)
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