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docs: add count to the Expressions guide

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Noticed this wasn't there, and wanted to link to it, so it's there now!
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Rebecca Le 2024-05-25 15:35:11 +08:00 committed by Rebecca Le
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documentation/topics/reference/expressions.md
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@ -74,6 +74,7 @@ For elixir-backed data layers, they will be a function or an MFA that will be ca
- `exists/2` | `exists(foo.bar, name == "fred")` takes an expression scoped to the destination resource, and checks if any related entry matches. See the section on `exists` below.
- `path.exists/2` | Same as `exists` but the source of the relationship is itself a nested relationship. See the section on `exists` below.
- `parent/1` | Allows an expression scoped to a resource to refer to the "outer" context. Used in relationship filters and `exists`
- `count/2` | `count(posts, filter: [query: [published == true]])` an inline aggregate function to count records in a relationship, scoped by a second optional expression. See the section on Inline Aggregates for more information.
## DateTime Functions