54 lines
1.7 KiB
Ruby
54 lines
1.7 KiB
Ruby
# encoding: utf-8
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module CouchRest
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module Model
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module Validations
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# Validates if a field is unique
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class UniquenessValidator < ActiveModel::EachValidator
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# Ensure we have a class available so we can check for a usable view
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# or add one if necessary.
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def setup(model)
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@model = model
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end
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def validate_each(document, attribute, value)
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keys = [attribute]
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unless options[:scope].nil?
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keys = (options[:scope].is_a?(Array) ? options[:scope] : [options[:scope]]) + keys
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end
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values = keys.map{|k| document.send(k)}
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values = values.first if values.length == 1
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view_name = options[:view].nil? ? "by_#{keys.join('_and_')}" : options[:view]
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model = (document.respond_to?(:model_proxy) && document.model_proxy ? document.model_proxy : @model)
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# Determine the base of the search
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base = options[:proxy].nil? ? model : document.instance_eval(options[:proxy])
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if base.respond_to?(:has_view?) && !base.has_view?(view_name)
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raise "View #{document.class.name}.#{options[:view]} does not exist!" unless options[:view].nil?
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keys << {:allow_nil => true}
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model.view_by(*keys)
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end
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rows = base.view(view_name, :key => values, :limit => 2, :include_docs => false)['rows']
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return if rows.empty?
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unless document.new?
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return if rows.find{|row| row['id'] == document.id}
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end
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if rows.length > 0
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opts = options.merge(:value => value)
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opts.delete(:scope) # Has meaning with I18n!
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document.errors.add(attribute, :taken, opts)
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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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end
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