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define_enum_for_matcher.rb
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define_enum_for_matcher.rb
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module Shoulda
module Matchers
module ActiveRecord
# The `define_enum_for` matcher is used to test that the `enum` macro has
# been used to decorate an attribute with enum capabilities.
#
# class Process < ActiveRecord::Base
# enum status: [:running, :stopped, :suspended]
#
# alias_attribute :kind, :SomeLegacyField
#
# enum kind: [:foo, :bar]
# end
#
# # RSpec
# RSpec.describe Process, type: :model do
# it { should define_enum_for(:status) }
# it { should define_enum_for(:kind) }
# end
#
# # Minitest (Shoulda)
# class ProcessTest < ActiveSupport::TestCase
# should define_enum_for(:status)
# should define_enum_for(:kind)
# end
#
# #### Qualifiers
#
# ##### with_values
#
# Use `with_values` to test that the attribute can only receive a certain
# set of possible values.
#
# class Process < ActiveRecord::Base
# enum status: [:running, :stopped, :suspended]
# end
#
# # RSpec
# RSpec.describe Process, type: :model do
# it do
# should define_enum_for(:status).
# with_values([:running, :stopped, :suspended])
# end
# end
#
# # Minitest (Shoulda)
# class ProcessTest < ActiveSupport::TestCase
# should define_enum_for(:status).
# with_values([:running, :stopped, :suspended])
# end
#
# If the values backing your enum attribute are arbitrary instead of a
# series of integers starting from 0, pass a hash to `with_values` instead
# of an array:
#
# class Process < ActiveRecord::Base
# enum status: {
# running: 0,
# stopped: 1,
# suspended: 3,
# other: 99
# }
# end
#
# # RSpec
# RSpec.describe Process, type: :model do
# it do
# should define_enum_for(:status).
# with_values(running: 0, stopped: 1, suspended: 3, other: 99)
# end
# end
#
# # Minitest (Shoulda)
# class ProcessTest < ActiveSupport::TestCase
# should define_enum_for(:status).
# with_values(running: 0, stopped: 1, suspended: 3, other: 99)
# end
#
# ##### backed_by_column_of_type
#
# Use `backed_by_column_of_type` when the column backing your column type
# is a string instead of an integer:
#
# class LoanApplication < ActiveRecord::Base
# enum status: {
# active: "active",
# pending: "pending",
# rejected: "rejected"
# }
# end
#
# # RSpec
# RSpec.describe LoanApplication, type: :model do
# it do
# should define_enum_for(:status).
# with_values(
# active: "active",
# pending: "pending",
# rejected: "rejected"
# ).
# backed_by_column_of_type(:string)
# end
# end
#
# # Minitest (Shoulda)
# class LoanApplicationTest < ActiveSupport::TestCase
# should define_enum_for(:status).
# with_values(
# active: "active",
# pending: "pending",
# rejected: "rejected"
# ).
# backed_by_column_of_type(:string)
# end
#
## ##### with_prefix
#
# Use `with_prefix` to test that the enum is defined with a `_prefix`
# option (Rails 5 only). Can take either a boolean or a symbol:
#
# class Issue < ActiveRecord::Base
# enum status: [:open, :closed], _prefix: :old
# end
#
# # RSpec
# RSpec.describe Issue, type: :model do
# it do
# should define_enum_for(:status).
# with_values([:open, :closed]).
# with_prefix(:old)
# end
# end
#
# # Minitest (Shoulda)
# class ProcessTest < ActiveSupport::TestCase
# should define_enum_for(:status).
# with_values([:open, :closed]).
# with_prefix(:old)
# end
#
# ##### with_suffix
#
# Use `with_suffix` to test that the enum is defined with a `_suffix`
# option (Rails 5 only). Can take either a boolean or a symbol:
#
# class Issue < ActiveRecord::Base
# enum status: [:open, :closed], _suffix: true
# end
#
# # RSpec
# RSpec.describe Issue, type: :model do
# it do
# should define_enum_for(:status).
# with_values([:open, :closed]).
# with_suffix
# end
# end
#
# # Minitest (Shoulda)
# class ProcessTest < ActiveSupport::TestCase
# should define_enum_for(:status).
# with_values([:open, :closed]).
# with_suffix
# end
#
# @return [DefineEnumForMatcher]
#
def define_enum_for(attribute_name)
DefineEnumForMatcher.new(attribute_name)
end
# @private
class DefineEnumForMatcher
def initialize(attribute_name)
@attribute_name = attribute_name
@options = { expected_enum_values: [] }
end
def description
description = "#{simple_description} backed by "
description << Shoulda::Matchers::Util.a_or_an(expected_column_type)
if expected_enum_values.any?
description << ' with values '
description << Shoulda::Matchers::Util.inspect_value(
expected_enum_values,
)
end
if options[:prefix]
description << ", prefix: #{options[:prefix].inspect}"
end
if options[:suffix]
description << ", suffix: #{options[:suffix].inspect}"
end
description
end
def with_values(expected_enum_values)
options[:expected_enum_values] = expected_enum_values
self
end
def with(expected_enum_values)
Shoulda::Matchers.warn_about_deprecated_method(
'The `with` qualifier on `define_enum_for`',
'`with_values`',
)
with_values(expected_enum_values)
end
def with_prefix(expected_prefix = true)
options[:prefix] = expected_prefix
self
end
def with_suffix(expected_suffix = true)
options[:suffix] = expected_suffix
self
end
def backed_by_column_of_type(expected_column_type)
options[:expected_column_type] = expected_column_type
self
end
def matches?(subject)
@record = subject
enum_defined? &&
enum_values_match? &&
column_type_matches? &&
enum_value_methods_exist?
end
def failure_message
message =
if enum_defined?
"Expected #{model} to #{expectation}. "
else
"Expected #{model} to #{expectation}, but "
end
message << "#{failure_message_continuation}."
Shoulda::Matchers.word_wrap(message)
end
def failure_message_when_negated
message = "Expected #{model} not to #{expectation}, but it did."
Shoulda::Matchers.word_wrap(message)
end
private
attr_reader :attribute_name, :options, :record,
:failure_message_continuation
def expectation # rubocop:disable Metrics/MethodLength
if enum_defined?
expectation = "#{simple_description} backed by "
expectation << Shoulda::Matchers::Util.a_or_an(expected_column_type)
if expected_enum_values.any?
expectation << ', mapping '
expectation << presented_enum_mapping(
normalized_expected_enum_values,
)
end
if expected_prefix
expectation <<
if expected_suffix
', '
else
' and '
end
expectation << 'prefixing accessor methods with '
expectation << "#{expected_prefix}_".inspect
end
if expected_suffix
expectation <<
if expected_prefix
', and '
else
' and '
end
expectation << 'suffixing accessor methods with '
expectation << "_#{expected_suffix}".inspect
end
expectation
else
simple_description
end
end
def simple_description
"define :#{attribute_name} as an enum"
end
def presented_enum_mapping(enum_values)
enum_values.
map { |output_to_input|
output_to_input.
map(&Shoulda::Matchers::Util.method(:inspect_value)).
join(' to ')
}.
to_sentence
end
def normalized_expected_enum_values
to_hash(expected_enum_values)
end
def expected_enum_value_names
to_array(expected_enum_values)
end
def expected_enum_values
options[:expected_enum_values]
end
def normalized_actual_enum_values
to_hash(actual_enum_values)
end
def actual_enum_values
model.send(attribute_name.to_s.pluralize)
end
def enum_defined?
if model.defined_enums.include?(attribute_name.to_s)
true
else
@failure_message_continuation =
"no such enum exists on #{model}"
false
end
end
def enum_values_match?
passed =
expected_enum_values.empty? ||
normalized_actual_enum_values == normalized_expected_enum_values
if passed
true
else
@failure_message_continuation =
"However, #{attribute_name.inspect} actually maps " +
presented_enum_mapping(normalized_actual_enum_values)
false
end
end
def column_type_matches?
if column.type == expected_column_type.to_sym
true
else
@failure_message_continuation =
"However, #{attribute_name.inspect} is "\
"#{Shoulda::Matchers::Util.a_or_an(column.type)}"\
' column'
false
end
end
def expected_column_type
options[:expected_column_type] || :integer
end
def column
key = attribute_name.to_s
column_name = model.attribute_alias(key) || key
model.columns_hash[column_name]
end
def model
record.class
end
def enum_value_methods_exist?
passed = expected_singleton_methods.all? do |method|
model.singleton_methods.include?(method)
end
if passed
true
else
message = "#{attribute_name.inspect} does map to these "
message << 'values, but the enum is '
if expected_prefix
if expected_suffix
message << 'configured with either a different prefix or '
message << 'suffix, or no prefix or suffix at all'
else
message << 'configured with either a different prefix or no '
message << 'prefix at all'
end
elsif expected_suffix
message << 'configured with either a different suffix or no '
message << 'suffix at all'
end
message << " (we can't tell which)"
@failure_message_continuation = message
false
end
end
def expected_singleton_methods
expected_enum_value_names.map do |name|
[expected_prefix, name, expected_suffix].
select(&:present?).
join('_').
to_sym
end
end
def expected_prefix
if options.include?(:prefix)
if options[:prefix] == true
attribute_name
else
options[:prefix]
end
end
end
def expected_suffix
if options.include?(:suffix)
if options[:suffix] == true
attribute_name
else
options[:suffix]
end
end
end
def to_hash(value)
if value.is_a?(Array)
value.each_with_index.inject({}) do |hash, (item, index)|
hash.merge(item.to_s => index)
end
else
value.stringify_keys
end
end
def to_array(value)
if value.is_a?(Array)
value.map(&:to_s)
else
value.keys.map(&:to_s)
end
end
end
end
end
end