feat: add allow_missing in the struct_field #1416

Xyedo · 2025-08-04T10:33:37Z

Add #[allow_missing] in the field attribute for DeserializeRow macro both on enforce_order flavor and match_by_name flavor

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I have split my patch into logically separate commits.
All commit messages clearly explain what they change and why.
I added relevant tests for new features and bug fixes.
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PR description sums up the changes and reasons why they should be introduced.
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I have adjusted the documentation in ./docs/source/.
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github-actions · 2025-08-04T10:36:50Z

cargo semver-checks found no API-breaking changes in this PR.
Checked commit: fd9db3f

Copilot

Pull Request Overview

This PR adds an allow_missing attribute to struct fields for both row and value deserialization, allowing fields to be initialized with Default::default() when missing from the database instead of failing. This feature provides compatibility with sqlx's #[sqlx(default)] attribute for smoother migration to scylla-rust-driver.

Implements #[scylla(allow_missing)] attribute for both struct-level and field-level usage
Adds support for the attribute in both row and value deserialization contexts
Includes comprehensive test coverage for the new functionality

Reviewed Changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
scylla-macros/src/lib.rs	Adds documentation for the new `allow_missing` attribute
scylla-macros/src/serialize/value.rs	Adds ignored `allow_missing` attribute parsing for value serialization
scylla-macros/src/serialize/row.rs	Adds ignored `allow_missing` attribute parsing for row serialization
scylla-macros/src/deserialize/value.rs	Implements `allow_missing` logic for value deserialization
scylla-macros/src/deserialize/row.rs	Implements `allow_missing` logic for row deserialization
scylla/tests/integration/macros/hygiene.rs	Adds hygiene tests for the new attribute
scylla-cql/src/deserialize/row_tests.rs	Adds comprehensive tests for `allow_missing` functionality

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scylla-macros/src/lib.rs

Lorak-mmk

Sorry for the delay! Please rebase on main to make semver checks work again.

Lorak-mmk · 2025-10-16T11:05:35Z

scylla-cql/src/deserialize/row_tests.rs

+#[test]
+fn test_struct_deserialization_loose_ordering_allow_missing() {
+    #[derive(DeserializeRow, PartialEq, Eq, Debug)]
+    #[scylla(crate = "crate")]
+    #[scylla(allow_missing)]


Please let's do one thing in this PR. Other field attributes can't be used on a struct, so let's remove this ability from this one as well, at least for now. It will also simplify this PR a lot.

sorry, i don't understand what your intention is, is it start with scylla[allow_missing] field attributes in this PR, and put scylla[allow_missing] in struct attributes in another (next) PR?

This is how understand this. Also, if we choose to allow this attribute to be put on a struct, then we want to allow others as well. Therefore, such another PR would necessarily by larger.
For now, not to impede the per-field attribute, let's strip this PR and get it merged.

sorry, i don't understand what your intention is, is it start with scylla[allow_missing] field attributes in this PR, and put scylla[allow_missing] in struct attributes in another (next) PR?

In another PR, or maybe not at all - we will have to decide if we want to include such functionality in the driver.
I see "using field attributes on a struct" as a totally separate matter from "using allow_missing in DeserializeRow", so I think it should not be put in a single commit or PR.

Hi! sorry for the delay, removing struct attribute and add enforce_order functionalities based on DeserializeValue code is done in my latest commit

scylla-macros/src/lib.rs

Copilot

Pull Request Overview

Copilot reviewed 8 out of 8 changed files in this pull request and generated 3 comments.

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Copilot · 2025-10-31T03:31:18Z

scylla-macros/src/lib.rs

+///
+/// #[scylla(allow_missing)]
+///
+/// if set, implementation will not fail if some columns are missing.


Inconsistent capitalization: sentence should start with a capital letter. Change 'if set' to 'If set'.

Suggested change

/// if set, implementation will not fail if some columns are missing.

/// If set, implementation will not fail if some columns are missing.

Copilot · 2025-10-31T03:31:19Z

scylla-macros/src/lib.rs

+///
+/// #[scylla(allow_missing)]
+///
+/// if set, implementation will not fail if some columns are missing.


Inconsistent capitalization: sentence should start with a capital letter. Change 'if set' to 'If set'.

Suggested change

/// if set, implementation will not fail if some columns are missing.

/// If set, implementation will not fail if some columns are missing.

Copilot · 2025-10-31T03:31:19Z

scylla-macros/src/lib.rs

+/// If the value of the field received from DB is null, the field will be
+/// initialized with `Default::default()`.


The documentation is incorrect. For DeserializeValue, the allow_missing attribute should handle missing fields in the UDT definition, not null values. The description should say 'If the UDT definition does not contain this field' similar to the field-level documentation at line 528.

Suggested change

/// If the value of the field received from DB is null, the field will be

/// initialized with `Default::default()`.

/// If the UDT definition does not contain this field, it will be initialized

/// with `Default::default()`.

🌱 Hmm, perhaps Copilot is right? Perhaps a better name would be allow_null? cc @Lorak-mmk

this is allow_missing struct attributes docs that i forgot to delete, mb!

add allow_missing field attribute with macro DeserializeRow to handle partial deserialization

Xyedo force-pushed the partial-DeserializeValue branch from 67e73b9 to 820386a Compare August 4, 2025 10:34

github-actions bot added the semver-checks-breaking cargo-semver-checks reports that this PR introduces breaking API changes label Aug 4, 2025

wprzytula requested review from Lorak-mmk, Copilot and wprzytula August 13, 2025 10:32

wprzytula assigned Xyedo Aug 13, 2025

Copilot AI reviewed Aug 13, 2025

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Xyedo force-pushed the partial-DeserializeValue branch from 820386a to 7091295 Compare September 1, 2025 09:52

Xyedo force-pushed the partial-DeserializeValue branch from 7091295 to 74184aa Compare September 9, 2025 02:56

Lorak-mmk requested changes Oct 16, 2025

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Lorak-mmk added the waiting-on-author Waiting for a response from issue/PR author label Oct 16, 2025

wprzytula requested changes Oct 17, 2025

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Xyedo force-pushed the partial-DeserializeValue branch from 74184aa to 27a4fa3 Compare October 31, 2025 03:15

github-actions bot removed the semver-checks-breaking cargo-semver-checks reports that this PR introduces breaking API changes label Oct 31, 2025

Xyedo force-pushed the partial-DeserializeValue branch from 27a4fa3 to 4c8defe Compare October 31, 2025 03:21

Xyedo requested review from Lorak-mmk, Copilot and wprzytula October 31, 2025 03:30

Copilot AI reviewed Oct 31, 2025

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feat: add allow_missing in the field attribute

fd9db3f

add allow_missing field attribute with macro DeserializeRow to handle partial deserialization

Xyedo force-pushed the partial-DeserializeValue branch from 4c8defe to fd9db3f Compare October 31, 2025 07:40

	/// if set, implementation will not fail if some columns are missing.
	/// If set, implementation will not fail if some columns are missing.

		/// If the value of the field received from DB is null, the field will be
		/// initialized with `Default::default()`.

feat: add allow_missing in the struct_field #1416

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