42 lines
2.1 KiB
Ruby
42 lines
2.1 KiB
Ruby
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module ActiveModel
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module Validations
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module ClassMethods
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# Validates that the specified attributes are not blank (as defined by Object#blank?). Happens by default on save. Example:
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#
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# class Person < ActiveRecord::Base
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# validates_presence_of :first_name
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# end
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#
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# The +first_name+ attribute must be in the object and it cannot be blank.
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#
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# If you want to validate the presence of a boolean field (where the real values are +true+ and +false+),
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# you will want to use
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#
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# validates_inclusion_of :field_name, :in => [true, false]
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#
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# This is due to the way Object#blank? handles boolean values:
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#
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# false.blank? # => true
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#
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# Configuration options:
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# * <tt>:message</tt> - A custom error message (default is: "can't be blank")
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# * <tt>:on</tt> - Specifies when this validation is active (default is <tt>:save</tt>, other options <tt>:create</tt>, <tt>:update</tt>)
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# * <tt>:if</tt> - Specifies a method, proc or string to call to determine if the validation should
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# occur (e.g. <tt>:if => :allow_validation</tt>, or <tt>:if => Proc.new { |user| user.signup_step > 2 }</tt>). The
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# method, proc or string should return or evaluate to a true or false value.
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# * <tt>:unless</tt> - Specifies a method, proc or string to call to determine if the validation should
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# not occur (e.g. <tt>:unless => :skip_validation</tt>, or <tt>:unless => Proc.new { |user| user.signup_step <= 2 }</tt>). The
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# method, proc or string should return or evaluate to a true or false value.
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def validates_presence_of(*attr_names)
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configuration = { :message => ActiveRecord::Errors.default_error_messages[:blank], :on => :save }
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configuration.update(attr_names.extract_options!)
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# can't use validates_each here, because it cannot cope with nonexistent attributes,
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# while errors.add_on_empty can
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send(validation_method(configuration[:on]), configuration) do |record|
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record.errors.add_on_blank(attr_names, configuration[:message])
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end
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end
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end
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end
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end
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