lib/minidoc/validations.rb
module Minidoc::Validations
class UniquenessValidator < ::ActiveModel::EachValidator
def initialize(options)
super(options.reverse_merge(case_sensitive: true))
end
def validate_each(record, attribute, value)
conditions = scope_conditions(record)
if options[:case_sensitive]
conditions[attribute] = value
else
conditions[attribute] = /^#{Regexp.escape(value.to_s)}$/i
end
# Make sure we're not including the current document in the query
if record._id
conditions[:_id] = { "$ne" => record.id }
end
if record.class.exists?(conditions)
record.errors.add(
attribute,
:taken,
options.except(:case_sensitive, :scope).merge(value: value)
)
end
end
def message(instance)
super || "has already been taken"
end
def scope_conditions(instance)
Array(options[:scope]).inject({}) do |conditions, key|
conditions.merge(key => instance[key])
end
end
end
end