37 lines
1.3 KiB
Markdown
37 lines
1.3 KiB
Markdown
# Todo
|
|
|
|
- move `prepare_*` methods from `dialect` to `query_compiler`
|
|
- add `session_insert_builder` and `session_update_builder` (returning multiple statements)
|
|
- finish fetch eager has-many/belongs-to relations
|
|
- implement lazy loading
|
|
- implement polymorphic class hierarchies
|
|
- finish `schema_repository` classes (move add/drop from `session` to `schema`)
|
|
- implement a flag class for enumerations
|
|
|
|
|
|
__Proposal for polymorphic classes:__
|
|
|
|
object_ptr::as<Type> does the following checks;
|
|
|
|
1. The requested type has a super class
|
|
2. Super class has a discriminator column defined
|
|
3. Super class has a discriminator value defined
|
|
4. Discriminator value is mapped to the requested type
|
|
|
|
If all checks succeed, the requested is fetched from the database.
|
|
|
|
```cpp
|
|
schema.attach<jobs::Payload>("payloads", make_polymorph("type"));
|
|
schema.attach<jobs::Payload, jobs::IdPayload>("id_list_payloads", make_polymorph_type("IdPayload"));
|
|
schema.attach<jobs::Payload, jobs::IdListPayload>("id_payloads", make_polymorph_type("IdListPayload"));
|
|
object::object_ptr<jobs::Payload> payload;
|
|
auto result = payload.as<jobs::IdPayload>();
|
|
if (result.is_ok()) {
|
|
const auto& is_payload = result.value();
|
|
// Use requested type
|
|
id_payload->id = 1;
|
|
}
|
|
payload.is_polymorphic();
|
|
payload.is_polymorphic_type<jobs::IdPayload>();
|
|
```
|