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82 lines
3.2 KiB
Ruby
82 lines
3.2 KiB
Ruby
# frozen_string_literal: true
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require "active_model/validations/comparability"
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module ActiveModel
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module Validations
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class ComparisonValidator < EachValidator # :nodoc:
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include Comparability
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def check_validity!
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unless (options.keys & COMPARE_CHECKS.keys).any?
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raise ArgumentError, "Expected one of :greater_than, :greater_than_or_equal_to, "\
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":equal_to, :less_than, :less_than_or_equal_to, or :other_than option to be supplied."
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end
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end
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def validate_each(record, attr_name, value)
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options.slice(*COMPARE_CHECKS.keys).each do |option, raw_option_value|
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option_value = option_value(record, raw_option_value)
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if value.nil? || value.blank?
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return record.errors.add(attr_name, :blank, **error_options(value, option_value))
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end
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unless value.public_send(COMPARE_CHECKS[option], option_value)
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record.errors.add(attr_name, option, **error_options(value, option_value))
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end
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rescue ArgumentError => e
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record.errors.add(attr_name, e.message)
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end
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end
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end
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module HelperMethods
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# Validates the value of a specified attribute fulfills all
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# defined comparisons with another value, proc, or attribute.
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#
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# class Person < ActiveRecord::Base
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# validates_comparison_of :value, greater_than: 'the sum of its parts'
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# end
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#
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# Configuration options:
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# * <tt>:message</tt> - A custom error message (default is: "failed comparison").
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# * <tt>:greater_than</tt> - Specifies the value must be greater than the
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# supplied value.
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# * <tt>:greater_than_or_equal_to</tt> - Specifies the value must be
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# greater than or equal to the supplied value.
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# * <tt>:equal_to</tt> - Specifies the value must be equal to the supplied
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# value.
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# * <tt>:less_than</tt> - Specifies the value must be less than the
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# supplied value.
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# * <tt>:less_than_or_equal_to</tt> - Specifies the value must be less
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# than or equal to the supplied value.
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# * <tt>:other_than</tt> - Specifies the value must not be equal to the
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# supplied value.
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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::Validations#validates</tt> for more information
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#
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# The validator requires at least one of the following checks to be supplied.
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# Each will accept a proc, value, or a symbol which corresponds to a method:
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#
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# * <tt>:greater_than</tt>
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# * <tt>:greater_than_or_equal_to</tt>
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# * <tt>:equal_to</tt>
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# * <tt>:less_than</tt>
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# * <tt>:less_than_or_equal_to</tt>
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# * <tt>:other_than</tt>
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#
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# For example:
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#
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# class Person < ActiveRecord::Base
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# validates_comparison_of :birth_date, less_than_or_equal_to: -> { Date.today }
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# validates_comparison_of :preferred_name, other_than: :given_name, allow_nil: true
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# end
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def validates_comparison_of(*attr_names)
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validates_with ComparisonValidator, _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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