fix(generator): ignored targets and enum sentinel value mapping - #110
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AngeloAvv merged 4 commits intoAug 18, 2026
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The auto-resolution loop in StandardMappingMethodAnalyzer computed extraMappingMethod guarded only by `callableMappingMethod == null`. ignoredTargets was read afterwards, when populating Binding.ignored, so the nested mapping method for an ignored target was still analyzed and could throw NoRelationFoundError for code that is never emitted. @mapping(target: 'nested', ignore: true) now short-circuits the extra mapping method analysis.
…pping Two defects in the null-source branch of the generated switch: - The <NULL> sentinel check in EnumExpressionFactory was nested inside the isPrimitive branch, so an enum return type emitted the sentinel as an identifier (MyEnum.<NULL>). - EnumMappingCodeProcessor built the null case as refer(returnType).property(target), assuming the return type is always an enum. With a String return type this produced String.RED, and String.<NULL> when mapping null to null — the latter fails at build time with an unhelpful parser error from the formatter. The null case now goes through the expression factory, like every other case in the switch, and the sentinel resolves to null for any target type.
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Included review availability: Your plan includes up to 1 review per rolling hour; 0 remain after this review. 📝 WalkthroughWalkthroughThe generator now caches ignored-target status, skips unnecessary nested analysis, and reuses that status when building bindings. Enum mappings resolve ChangesMapping generator behavior
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: ⚪ Minimal · up to This change corrects ignored-target handling and sentinel value generation in the mapper generator, with focused test coverage; no actionable merge-blocking risk remains beyond normal checks. Poem
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`@packages/dart_mapper_generator/lib/src/analyzers/binding/standard_mapping_method_analyzer.dart`:
- Around line 479-483: Update the Step 1 dot-notation handling in the standard
mapping analyzer to skip binding analysis when the target is in ignoredTargets,
matching the isIgnored guard used for extraMappingMethod. Ensure ignored nested
targets do not create bindings or trigger NoRelationFoundError, while
non-ignored targets retain the existing analysis behavior.
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packages/dart_mapper_generator/lib/src/analyzers/binding/standard_mapping_method_analyzer.dartpackages/dart_mapper_generator/lib/src/factories/enum_expression_factory.dartpackages/dart_mapper_generator/lib/src/processors/mapping_code/enum_mapping_code_processor.dartpackages/dart_mapper_generator/test/golden/src/nested_test_src.dartpackages/dart_mapper_generator/test/golden/src/null_value_source_test_src.dart
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<ANY_REMAINING> and <ANY_UNMAPPED> built the switch fallback as refer(returnType).property(target), which assumes an enum return type. With a String return type this emitted String.UNKNOWN instead of 'UNKNOWN'; with an int return type it emitted int.-1, which fails to parse at build time. The fallback now goes through the same expression factory path as the regular cases and the <NULL> source case, so the target type decides how the value is rendered. The <ANY_UNMAPPED> special case for <NULL> is no longer needed: the factory resolves the sentinel for any target type.
AngeloAvv
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…rgets The ignored-target guard was applied only to the auto-resolution loop of the standard analyzer. Three other binding sites computed extraMappingMethod without it: - StandardMappingMethodAnalyzer, explicit dot-notation mappings. @mapping(target: 'x', source: 'a.b', ignore: true) still analyzed the nested converter and could throw NoRelationFoundError. - BuiltBindingsAnalyzer, both the dot-notation and the auto-resolution branch. Here the symptom is worse than an error: the synthesized converter took precedence over the ignored flag, so ignore was silently disregarded and the generated builder assigned a converted value instead of null — leaving required target fields unset and failing at runtime rather than at build time. All four sites now share the same guard.
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Fixes two families of build-time failures in the generator:
ignore: truebeing disregarded, and sentinel value mappings emitting invalid code.1.
ignore: truedoes not suppress nested converter synthesisEvery binding site computed
extraMappingMethodguarded only bycallableMappingMethod == null.ignoredTargetswas consulted afterwards, when populatingBinding.ignored, so the nested mapping method for an ignored target was analyzed — and in the built_value case emitted — regardless.Four sites were affected:
StandardMappingMethodAnalyzer, auto-resolutionNoRelationFoundErrorStandardMappingMethodAnalyzer, explicit dot-notation sourceNoRelationFoundErrorBuiltBindingsAnalyzer, auto-resolutionignoresilently disregardedBuiltBindingsAnalyzer, explicit dot-notation sourceignoresilently disregardedStandard classes
The error names a converter for a mapping that is never emitted. Same outcome with an explicit source:
@Mapping(target: 'booking', source: 'wrapper.booking', ignore: true).built_value classes
Here the symptom is worse than an error, because there is no error. The synthesized converter took precedence over the
ignoredflag, so the annotation was quietly dropped:The generated code compiles, and a required field left unset by the converter surfaces as a built_value runtime error instead of a build-time one. After the fix:
..inner = null.All four sites now share the same guard.
2. Sentinel value mappings emit invalid code
The sentinel-driven cases of the generated switch carry a target name rather than a
Binding, so they bypassed the normal rendering path and were built asrefer(returnType).property(target)— which assumes the return type is always an enum. The<NULL>check inEnumExpressionFactorywas also nested inside theisPrimitivebranch.<NULL>as sourceString.<NULL>, orMyEnum.<NULL>for an enum return type.String.REDinstead of'RED'.The first case fails inside the formatter, with a parser error that points at a column offset and names neither the mapper nor the annotation responsible:
<ANY_REMAINING>/<ANY_UNMAPPED>Same defect in the switch fallback. With a
Stringreturn type it emittedString.UNKNOWNinstead of'UNKNOWN'— parsable, but wrong. With anintreturn type it did not parse at all:The fix
All three sentinel cases now go through the same expression factory as the regular cases, so the target type — enum,
String,num— decides how the value is rendered, and the<NULL>sentinel resolves tonullfor any target type.The
<ANY_UNMAPPED>special case for<NULL>and thequalifiedEnumNamelocal are gone: both were compensating for the bypassed path.Tests
Golden coverage added for: ignored nested field; ignored field with a dot-notation source;
<NULL>to<NULL>with enum andStringreturn types;<NULL>to a concreteString;<NULL>to a concrete enum value;<ANY_REMAINING>toStringand toint;<ANY_UNMAPPED>with aStringreturn type. Suite goes from 136 to 146 passing.The built_value fix is not covered by a golden test — as documented in
built_value_test_src.dart,source_gen_testcannot runbuilt_value_generator, so theBuilt<T, TBuilder>supertype detection that selects this code path never triggers there. It was verified against a realbuild_runnerrun instead.