Comments (3)
It might be useful for transactional semantics, I guess. You hold onto value, and when you decide to update it, make sure that nobody has updated it before you
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Does :db.fn/call solves it for you?
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Ah yes that works. I still think cas is not entirely useful in its current form because one typically wouldn't know the "old-value" without doing a query first.
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Related Issues (20)
- How to hot fix aot code?
- Rules - Required bindings doesn't evaluate correctly HOT 1
- Datascript101 link is dead HOT 1
- `get-else` fails when passed a lookup.
- `entity` returns entities for ids that don't exist HOT 2
- Is there any doc to demo idiom way to implement pagination in datascript? HOT 4
- Upsert of datom with composite tuple containing lookup ref fails HOT 5
- Recursive reverse lookups not working quite like it should HOT 1
- Lookup ref in composite tuple during upsert HOT 2
- do we have double vector type? HOT 2
- `:xform` is not called on ref attributes HOT 2
- Query performance with rules is much worse than "equivalent" inline clause HOT 3
- Ability to pass multiple functions into query HOT 1
- Index usage doesn't match datomic behavior and appears to be much less efficient HOT 1
- Inaccurate temporary IDs after transit deserialization
- Unable to resolve tempids on :db.unique/identity refs HOT 2
- Handling of BigDecimal
- Regression in 1.6.4: Canβt sum relations with different attrs HOT 1
- Regression in 1.6.4: unbound vars not filtered HOT 1
- Indexes on vectors return surprising results HOT 1
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