slate

Types

AccessMode

Access mode for opening tables.

pub type AccessMode {
  ReadWrite
  ReadOnly
}

Constructors

```
ReadWrite
```
Read and write access (default)
```
ReadOnly
```
Read-only access — writes will return AccessDenied

DetsError

</>

Errors that can occur during DETS operations.

pub type DetsError {
  NotFound
  FileNotFound
  AlreadyOpen
  TableDoesNotExist
  FileSizeLimitExceeded
  KeyAlreadyPresent
  AccessDenied
  TypeMismatch
  TableNamePoolExhausted
  DecodeErrors(List(decode.DecodeError))
  ErlangError(String)
}

Constructors

```
NotFound
```
No value found for the given key
```
FileNotFound
```
Table file does not exist (when opening without create)
```
AlreadyOpen
```
Table is already open with a different configuration
```
TableDoesNotExist
```
The table does not exist (not open)
```
FileSizeLimitExceeded
```
File exceeds the 2 GB DETS limit
```
KeyAlreadyPresent
```
Key already exists (for insert_new)
```
AccessDenied
```
Write operation attempted on a read-only table
```
TypeMismatch
```
Table type mismatch (e.g., opening a set file as a bag)
```
TableNamePoolExhausted
```
All internal table name slots are in use; close unused tables to free slots
```
DecodeErrors(List(decode.DecodeError))
```
Data read from disk did not match the expected Gleam types
```
ErlangError(String)
```
Erlang-level error (catch-all)

Kind

</>

DETS table type.

pub type Kind {
  Set
  Bag
  DuplicateBag
}

Constructors

```
Set
```
One value per key (default)
```
Bag
```
Multiple distinct values per key
```
DuplicateBag
```
Multiple values per key, duplicates allowed

RepairPolicy

</>

Auto-repair policy for improperly closed tables.

pub type RepairPolicy {
  AutoRepair
  ForceRepair
  NoRepair
}

Constructors

```
AutoRepair
```
Repair automatically if needed (default)
```
ForceRepair
```
Force repair even if file appears clean
```
NoRepair
```
Don’t repair, return error instead

TableInfo

</>

Information about an open DETS table.

pub type TableInfo {
  TableInfo(file_size: Int, object_count: Int, kind: Kind)
}

Constructors

TableInfo(file_size: Int, object_count: Int, kind: Kind)

Values

is_dets_file

</>

pub fn is_dets_file(path: String) -> Result(Bool, DetsError)

Check whether the given file is a valid DETS file.

Returns Ok(True) if the file is a valid DETS file, Ok(False) if it exists but is not a DETS file, or an error if the file cannot be read.

let assert Ok(True) = slate.is_dets_file("data/cache.dets")
let assert Ok(False) = slate.is_dets_file("README.md")