feat(dpp): immutable properties on mutable document types - #4815
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Adds the doctype-level `immutable` keyword (meta-schema v3, protocol version 14): an array of top-level property names frozen at document creation on a mutable document type, so the rest of the document stays replaceable while those never change. - DocumentTypeV2 gains `immutable_fields`, exposed through DocumentTypeV2Getters (V0/V1 return an empty set). - Parser generation 3 reads the keyword; under full validation it refuses unknown or nested names, `$` system properties, and a list on a non-mutable type. Stored contracts record the list as declared. - Replace state validation v1 intersects the action's changed_data_fields with the list and fails with DocumentImmutablePropertyChangedError (state code 40128, StateError discriminant 109). - Contract update v1: the list may grow but never shrink; the compat differ strips the key like `indices` and `required`. - wasm-dpp error mapping and a book section. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
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📝 WalkthroughWalkthroughThe change adds protocol v14 immutable properties for mutable document types. It parses and stores immutable top-level fields, restricts contract updates, rejects invalid replacements, adds consensus error code 40128, compares underlying values, and adds parser and end-to-end tests. ChangesImmutable Document Properties
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~60 minutes Change: Feature Sequence Diagram(s)sequenceDiagram
participant ReplaceTransition
participant validate_state_v1
participant DocumentTypeV2
participant ConsensusError
ReplaceTransition->>validate_state_v1: provide changed_data_fields and added_data_fields
validate_state_v1->>DocumentTypeV2: read immutable_fields and immutable_fields_allow_setting
DocumentTypeV2-->>validate_state_v1: return immutable property sets
validate_state_v1->>ConsensusError: create DocumentImmutablePropertyChangedError
ConsensusError-->>ReplaceTransition: return state error code 40128
Merge Risk: 🔵 Low · up to Some valid platform-value maps can be treated as unchanged when they differ. Make map matching one-to-one before merge to preserve comparison correctness. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 67.86% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 112 functions across 23 files. (2 skipped: 2 unsupported.) ✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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Codecov Report❌ Patch coverage is Additional details and impacted files@@ Coverage Diff @@
## v4.2-dev #4815 +/- ##
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- Coverage 77.77% 77.11% -0.66%
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Files 2963 2963
Lines 425507 429986 +4479
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+ Hits 330921 331583 +662
- Misses 94586 98403 +3817
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… set once A second doctype-level list, `immutableAllowSetting` (Rust `immutable_fields_allow_setting`), names immutable properties a replace may still set while the stored document has no value for them. Once present they are frozen like the rest of the `immutable` list. Every entry must also be in `immutable` (parser lint under full validation). - The replace action now carries `added_data_fields`, the subset of `changed_data_fields` the stored document lacked, so the state check can tell a first-time set from a change or a removal. - Replace state validation v1 lets a changed immutable property through exactly when it is in the allow-setting list and was absent before. - Contract update v1: the allow-setting list may shrink at any time and may only gain a property that becomes immutable in the same update; the compat differ strips the key like `immutable`. - Meta-schema v3 entry, book section, parser / update / e2e tests. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
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Two issues reproduced on this revision, detailed inline. Validation: 30 targeted DPP tests and all 13 existing immutable-property end-to-end tests passed; three temporary end-to-end regression cases reproduced the issues below. Original sources were restored.
| if let Some(property) = self.changed_data_fields().iter().find(|field| { | ||
| immutable_fields.contains(*field) | ||
| && !(allow_setting.contains(*field) && added_fields.contains(*field)) | ||
| }) { |
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[P2] Compare nested immutable values independently of representation
The change set uses equal_underlying_data, which falls back to ordinary equality for nested objects. Storage can change integer widths (U64(7) becomes U8(7)) and reorder object members by schema position. Consequently, replacing only the mutable body while preserving an immutable object produces a paid DocumentImmutablePropertyChangedError. Both cases reproduce end-to-end. This check needs a recursive comparison that ignores equivalent integer representations and object key order.
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Fixed in d6f3c1a. Value::equal_underlying_data now recurses: maps compare member by member regardless of order, arrays position by position, both with the existing integer-width and bytes leniency, so an object storage reordered by position or narrowed (U64 7 to U8 7) reads as unchanged. Since the replace transformer builds changed_data_fields with it, the state check needed no change. Regression: the e2e object test now creates meta with members in reverse position order and a U64 integer, replaces only body (accepted), then changes the integer and the string (each refused). Seven platform-value unit tests cover order, width, nesting, arrays, and the negative cases.
| if !document_type.properties.contains_key(property) { | ||
| let hint = if property.contains('.') { | ||
| "; nested paths are not accepted, list the top-level property that contains \ | ||
| it to freeze it whole" | ||
| } else { | ||
| "" | ||
| }; | ||
| return Err(structure_error(format!( | ||
| "document type \"{name}\" lists \"{property}\" as immutable, but it is not a \ | ||
| top-level property of the document type{hint}" | ||
| ))); | ||
| } |
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[P2] Reject transient properties in the immutable list
The parser accepts a property listed in required, transient, and immutable. Creation discards its value, so every replacement supplying it fails the immutable check—even when unchanged—while omitting it fails required-field validation. This makes the accepted document type permanently uneditable, and the grow-only rule prevents removing the restriction afterward. Reject immutable/transient overlap during full schema validation. Both replacement failures reproduce end-to-end.
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Fixed in d6f3c1a. The parser refuses a property listed under both transient and immutable under full validation ("a transient property is never stored, so every replace that supplies it would be refused as changing an immutable property"). Unit test rejects_a_transient_property; meta-schema description and the book bullet updated.
…nsient immutables Review round 1 on the immutable-properties change: - `Value::equal_underlying_data` fell back to `==` for containers, so an immutable object that storage had reordered by schema position or whose integers it had narrowed (U64 7 -> U8 7) read as changed, and a replace touching only mutable properties was refused. It now recurses: maps compare member by member regardless of order, arrays position by position, both with the existing integer-width and bytes leniency. - A property listed under both `transient` and `immutable` left the type permanently uneditable (a transient value is never stored, so any replace supplying it counts as setting it, while omitting a required one fails required-field validation). The parser now refuses the overlap under full validation. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
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Actionable comments posted: 1
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Inline comments:
In `@packages/rs-platform-value/src/eq.rs`:
- Around line 177-183: Update the Value::Map branch in the equality
implementation to enforce one-to-one entry matching. After confirming equal map
lengths, track which entries in that are already matched and only accept an
unused entry whose key and value satisfy equal_underlying_data; mark each
selected entry consumed before continuing.
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book/src/data-model/documents.mdpackages/rs-dpp/schema/meta_schemas/document/v3/document-meta.jsonpackages/rs-dpp/src/data_contract/document_type/accessors/mod.rspackages/rs-dpp/src/data_contract/document_type/accessors/v2/mod.rspackages/rs-dpp/src/data_contract/document_type/class_methods/try_from_schema/common/mod.rspackages/rs-dpp/src/data_contract/document_type/class_methods/try_from_schema/v3/immutable_tests.rspackages/rs-dpp/src/data_contract/document_type/class_methods/try_from_schema/v3/mod.rspackages/rs-dpp/src/data_contract/document_type/methods/validate_update/v1/mod.rspackages/rs-dpp/src/data_contract/document_type/mod.rspackages/rs-dpp/src/data_contract/document_type/schema/validate_schema_compatibility/v1/mod.rspackages/rs-dpp/src/data_contract/document_type/v2/accessors.rspackages/rs-dpp/src/data_contract/document_type/v2/mod.rspackages/rs-drive-abci/src/execution/validation/state_transition/state_transitions/batch/action_validation/document/document_replace_transition_action/state_v1/mod.rspackages/rs-drive-abci/src/execution/validation/state_transition/state_transitions/batch/tests/document/immutable.rspackages/rs-drive/src/state_transition_action/batch/batched_transition/document_transition/document_replace_transition_action/mod.rspackages/rs-drive/src/state_transition_action/batch/batched_transition/document_transition/document_replace_transition_action/v0/mod.rspackages/rs-drive/src/state_transition_action/batch/batched_transition/document_transition/document_replace_transition_action/v0/transformer.rspackages/rs-drive/src/state_transition_action/batch/tests.rspackages/rs-platform-value/src/eq.rs
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…_data A map is a list of pairs, so a duplicated key on one side must not be satisfied twice by a single entry on the other. Matched entries are now consumed. Review finding on #4815. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
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…xample app Swift half of the protocol v14 `immutable` / `immutableAllowSetting` parity (#4815), mirroring the Kotlin commit: - New `DocumentTypeImmutability` value type (deduped, sorted lists + `lockState(for:hasStoredValue:)` -> editable / frozen / settableOnce), exposed on `PersistentDocumentType` as computed accessors read off the persisted `schemaJSON`. No new stored column: one would move the entity hash and cost a DashSchema version plus a fixture store, which a display-only keyword does not justify. - DocumentTypeDetailsView and StorageRecordDetailViews list the frozen and settable-once properties. - DocumentFieldsView badges each property and disables frozen fields on the replace flow (TransitionDetailView passes the type's immutability only for documentReplace); ReplaceDocumentView shows which frozen properties the stored document already has a value for. - 9 unit tests; migration tests unchanged and passing. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
2 participants
Issue being fixed or feature implemented
Until now a document type was all-or-nothing:
documentsMutable: truelet a replace rewrite every property, andfalsefroze the whole document. Apps regularly need a middle ground, such as a post whoseauthormust never change while the body stays editable, or a creation-time reference that must not be repointed. Contracts had no way to express that, so it could only be "enforced" client-side, which is not enforcement.What was done?
immutable(meta-schema v3, protocol version 14): an array of top-level property names that are frozen at creation on a mutable document type. It sits next torequiredandtransient.DocumentTypeV2gainsimmutable_fields, exposed asDocumentTypeV2Getters::immutable_fields(). V0 and V1 document types return an empty set.$system property, and any list on a type withdocumentsMutable: false. The non-validating path, which stored contracts take, records the list as declared, so these lints can be tightened later without making a committed contract unreadable. Only the array shape is enforced on both paths.changed_data_fields(changed value, added property, removed property) is intersected with the type's immutable list, and a hit fails the replace with the newDocumentImmutablePropertyChangedError(state code 40128,StateErrordiscriminant 109, frozen-discriminant test extended). No new state read. Transfers, price updates and purchases carry no property data and are unaffected.validate_updatev1): the list may grow but never shrink (DocumentTypeUpdateError). The schema compatibility differ v1 now strips the top-levelimmutablekey likeindicesandrequired, so a change is judged in exactly one place instead of hard-erroring as an unsupported keyword.immutableAllowSetting(immutable_fields_allow_settingin Rust), names immutable properties a replace may still set while the stored document has no value for them; once present they are frozen like the rest. Every entry must also be inimmutable(parser lint). To tell a first-time set from a change, the replace action now also carriesadded_data_fields, the subset ofchanged_data_fieldsthe stored document lacked. On contract update this list may lose entries at any time (a tightening) but may only gain one for a property that becomes immutable in the same update, so nothing already frozen starts accepting a late set.Value::equal_underlying_datanow recurses into maps (member order ignored) and arrays with the same integer-width leniency, so an untouched immutable object that storage reordered or narrowed no longer counts as changed; and the parser refuses a property that is bothtransientandimmutable, which would have left the type permanently uneditable.JavaScript discovery of the declarations is the stacked #4817.
Design choices worth a look:
changed_data_fieldscompares top-level properties, so listing an object freezes it whole, nested values included. Dotted paths would need a per-path comparison against the stored document; straightforward to add later if wanted.immutableAllowSetting, which permits exactly one transition: absent to present.required/transient; happy to rename (immutableProperties,immutableSettable, ...) if preferred.How Has This Been Tested?
try_from_schema/v3/immutable_tests.rs: both validation modes, every lint, the array shape, the stored-contract path, PV13 gating (inert without validation, rejected by meta-schema v2 with it), and the dispatcher at latest. Update validator v1: removal refused, addition accepted, reorder accepted. Compat differ v1: animmutable-only diff is ignored.StateErrorfrozen-discriminant test extended to 109.batch/tests/document/immutable.rsthroughprocess_raw_state_transitions: a mutable-only replace succeeds and is stored; changing, adding or removing an immutable property is aPaidConsensusErrorcarryingDocumentImmutablePropertyChangedErrorwith the property name and leaves storage untouched; an immutable object is frozen whole but does not false-positive when unchanged; the first changed property in name order is reported; a contract update removing an entry is refused; a contract update adding an entry is accepted and enforced afterwards.immutableAllowSetting: 7 more parser tests (parses on both modes, empty by default, entry not inimmutablerefused, unknown entry refused, non-string entry refused on both modes, stored-contract path, PV13 gating), 3 more update-validator tests (drop accepted, allowance on an already-immutable property refused, newly immutable property with allowance accepted), the compat test extended, and 5 more end-to-end tests (set once then frozen against change and removal while the rest stays editable; set at creation stays frozen; the allowance does not leak to other immutable properties; contract update granting the allowance to an already-immutable property refused; contract update adding a newly immutable property with the allowance accepted and enforced).document_typeand consensus error tests, drive-abcireplacement_tests,required_since,index_onlyanddata_contract_update.cargo clippy -p dpp -p drive-abci --testsandcargo check -p wasm-dppclean.Breaking Changes
None. Protocol version 14 is unreleased; the keyword is rejected by meta-schema v2 and ignored by earlier parser generations, and nothing changes for contracts that do not use it.
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