discourse/migrations/lib/common/enum.rb
Gerhard Schlager 89f26da39d
MT: Switch to nested module style across migrations/ (#38564)
Ruby's compact module syntax (`module
Migrations::Database::Schema::DSL`) breaks lexical constant lookup —
`Module.nesting` only includes the innermost constant, so every
cross-module reference must be fully qualified. In practice this means
writing `Migrations::Database::Schema::Helpers` even when you're already
inside `Migrations::Database::Schema`.

Nested module definitions restore the full nesting chain, which brings
several practical benefits:

- **Less verbose code**: references like `Schema::Helpers`,
`Database::IntermediateDB`, or `Converters::Base::ProgressStep` work
without repeating the full path from root
- **Easier to write new code**: contributors don't need to remember
which prefixes are required — if you're inside the namespace, short
names just work
- **Fewer aliasing workarounds**: removes the need for constants like
`MappingType = Migrations::Importer::MappingType` that existed solely to
shorten references
- **Standard Ruby style**: consistent with how most Ruby projects and
gems structure their namespaces

The diff is large but mechanical — no logic changes, just module
wrapping and shortening references that the nesting now resolves.
Generated code (intermediate_db models/enums) keeps fully qualified
references like `Migrations::Database.format_*` since it must work
regardless of the configured output namespace.

- Convert 138 lib files from compact to nested module definitions
- Remove now-redundant fully qualified prefixes and aliases
- Update model and enum writers to generate nested modules with correct
indentation
- Regenerate all intermediate_db models and enums
2026-03-19 18:15:19 +01:00

43 lines
1.2 KiB
Ruby

# frozen_string_literal: true
module Migrations
# Module that adds enumeration functionality to modules that extend it.
# When extended, adds methods for checking and retrieving enum values.
#
# @example
# module MyEnum
# extend Migrations::Enum
#
# FIRST = 0
# SECOND = 1
# end
#
# @!method valid?(value)
# Checks if the provided value is a valid enum value
# @param value [Integer, String] The value to check
# @return [Boolean] true if the value is included in the enum values
#
# @!method values
# Returns all values defined in the enum
# @return [Array<Integer, String>] Array of all enum values
module Enum
def self.extended(base)
TracePoint
.new(:end) do |tp|
if tp.self == base
enum_values =
base.constants.map { |c| base.const_get(c) }.select { |v| !v.is_a?(Module) }.freeze
values = base.const_set(:ALL_ENUM_VALUES__, enum_values)
base.private_constant :ALL_ENUM_VALUES__
base.define_singleton_method(:valid?) { |value| values.include?(value) }
base.define_singleton_method(:values) { values }
tp.disable
end
end
.enable
end
end
end