65 lines
1.9 KiB
Ruby
65 lines
1.9 KiB
Ruby
#
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# Copyright (C) 2011 Instructure, Inc.
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#
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# This file is part of Canvas.
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#
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# Canvas is free software: you can redistribute it and/or modify it under
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# the terms of the GNU Affero General Public License as published by the Free
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# Software Foundation, version 3 of the License.
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#
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# Canvas is distributed in the hope that it will be useful, but WITHOUT ANY
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# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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# A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
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# details.
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#
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# You should have received a copy of the GNU Affero General Public License along
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# with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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module CustomValidations
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module ClassMethods
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def validates_as_url(*fields)
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validates_each(fields, :allow_nil => true) do |record, attr, value|
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begin
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value, uri = CanvasHttp.validate_url(value)
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record.send("#{attr}=", value)
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rescue URI::Error, ArgumentError
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record.errors.add attr, 'is not a valid URL'
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end
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end
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end
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def validates_as_readonly(*fields)
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validates_each(fields) do |record, attr, value|
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if !record.new_record? && record.send("#{attr}_changed?")
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record.errors.add attr, "cannot be changed"
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end
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end
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end
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# alloweds is a hash of old_value => [new_value]
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# on update, only those transitions will be allowed for the given field
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def validates_allowed_transitions(field, alloweds)
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validates_each(field) do |record, attr, value|
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if !record.new_record? && record.send("#{attr}_changed?")
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old_val = record.send("#{attr}_was")
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unless alloweds.any? { |old,news| old_val == old && Array(news).include?(value) }
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record.errors.add attr, "cannot be changed to that value"
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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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def self.included(klass)
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if klass < ActiveRecord::Base
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klass.send :extend, ClassMethods
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end
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end
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end
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