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39 lines
1.4 KiB
Ruby
39 lines
1.4 KiB
Ruby
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module ActiveModel
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module Validations
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class PresenceValidator < EachValidator # :nodoc:
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def validate_each(record, attr_name, value)
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record.errors.add(attr_name, :blank, options) if value.blank?
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end
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end
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module HelperMethods
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# Validates that the specified attributes are not blank (as defined by
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# Object#blank?). Happens by default on save.
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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
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# values are +true+ and +false+), you will want to use
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# <tt>validates_inclusion_of :field_name, in: [true, false]</tt>.
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#
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# This is due to the way Object#blank? handles boolean values:
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# <tt>false.blank? # => true</tt>.
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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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#
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# There is also a list of default options supported by every validator:
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# +:if+, +:unless+, +:on+, +:allow_nil+, +:allow_blank+, and +:strict+.
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# See <tt>ActiveModel::Validation#validates</tt> for more information
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def validates_presence_of(*attr_names)
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validates_with PresenceValidator, _merge_attributes(attr_names)
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end
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end
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end
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end
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