feat(datasource mongoose): handle nested enums

[arnaud-moncel]

Definition of Done

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Note

Add nested enum support to the Mongoose datasource and related utilities

• Introduces NestedEnumColumnType ({ type: 'Enum', enumValues: string[] }) in schema.ts and a TypeGetter.isEnumField helper to detect inline enum sub-fields within composite column types.
• Updates the Mongoose fields generator to emit NestedEnumColumnType for string-enum sub-documents instead of treating them as plain strings.
• Propagates enum awareness through the schema generator, binary decorator, typing generator, and plugin-flattener so nested enums are preserved (not transformed) and correctly typed throughout the stack.
• Behavioral Change: composite fields that previously had enum sub-fields serialized as plain strings will now appear as Enum type with an enumValues list in the Forest schema and generated TypeScript typings.

Changes since #1765 opened

• Modified SchemaGeneratorFields.convertColumnType method to sort enum values for nested enum sub-fields within composite column types [5ef4283]

^{Macroscope summarized 4732be8.}

[qltysh]

5 new issues

Tool	Category	Rule	Count
qlty	Structure	Function with many returns (count = 4): convertValueHelper	3
qlty	Structure	High total complexity (count = 55)	1
qlty	Structure	Function with high complexity (count = 13): convertValueHelper	1

[qltysh]

Coverage Impact

⬆️ Merging this pull request will increase total coverage on main by 0.02%.

Modified Files with Diff Coverage (7)

Rating	File	% Diff	Uncovered Line #s
	packages/datasource-mongoose/src/utils/schema/fields.ts	100.0%
	packages/agent/src/utils/forest-schema/generator-fields.ts	100.0%
	packages/plugin-flattener/src/flatten-column/helpers.ts	100.0%
	packages/plugin-flattener/src/flatten-column/customization.ts	100.0%
	...ages/datasource-customizer/src/decorators/binary/collection.ts	100.0%
	packages/datasource-customizer/src/typing-generator.ts	100.0%
	packages/datasource-toolkit/src/validation/type-getter.ts	100.0%
	Total	100.0%

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[christophebrun-forest]

One suggestion regarding the sorting of Enum values. It's done elsewhere (See line 71)

[christophebrun-forest]

LGTM