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# frozen_string_literal: true
module Grape
module Validations
module Validators
class CoerceValidator < Base
def initialize(attrs, options, required, scope, **opts)
super
@converter = if type.is_a?(Grape::Validations::Types::VariantCollectionCoercer)
type
else
Types.build_coercer(type, method: @option[:method])
end
end
def validate_param!(attr_name, params)
raise validation_exception(attr_name) unless params.is_a? Hash
new_value = coerce_value(params[attr_name])
raise validation_exception(attr_name, new_value.message) unless valid_type?(new_value)
# Don't assign a value if it is identical. It fixes a problem with Hashie::Mash
# which looses wrappers for hashes and arrays after reassigning values
#
# h = Hashie::Mash.new(list: [1, 2, 3, 4])
# => #<Hashie::Mash list=#<Hashie::Array [1, 2, 3, 4]>>
# list = h.list
# h[:list] = list
# h
# => #<Hashie::Mash list=[1, 2, 3, 4]>
return if params[attr_name].instance_of?(new_value.class) && params[attr_name] == new_value
params[attr_name] = new_value
end
private
# @!attribute [r] converter
# Object that will be used for parameter coercion and type checking.
#
# See {Types.build_coercer}
#
# @return [Object]
attr_reader :converter
def valid_type?(val)
!val.is_a?(Types::InvalidValue)
end
def coerce_value(val)
converter.call(val)
# Some custom types might fail, so it should be treated as an invalid value
rescue StandardError
Types::InvalidValue.new
end
# Type to which the parameter will be coerced.
#
# @return [Class]
def type
@option[:type].is_a?(Hash) ? @option[:type][:value] : @option[:type]
end
def validation_exception(attr_name, custom_msg = nil)
Grape::Exceptions::Validation.new(
params: [@scope.full_name(attr_name)],
message: custom_msg || message(:coerce)
)
end
end
end
end
end
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