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The `model` module has historically been one giant module re-exporting
all of the model types, which is somewhere around 100 types. This can be
a lot to look at for a new user and somewhat overwhelming, especially
with a large number of fine-grained imports from the module.
The module is now neatly split up into submodules, mostly like it has
been internally since the early versions of the library. The submodules
are:
- application
- channel
- error
- event
- gateway
- guild
- id
- invite
- misc
- permissions
- prelude
- user
- voice
- webhook
Each submodule contains types that are "owned" by the module. For
example, the `guild` submodule contains, but not limited to, Emoji,
AuditLogsEntry, Role, and Member. `channel` contains, but not limited
to, Attachment, Embed, Message, and Reaction.
Upgrade path:
Instead of glob importing the models via `use serenity::model::*;`,
instead glob import via the prelude:
```rust
use serenity::model::prelude::*;
```
Instead of importing from the root model module:
```rust
use serenity::model::{Guild, Message, OnlineStatus, Role, User};
```
instead import from the submodules like so:
```rust
use serenity::model::channel::Message;
use serenity::model::guild::{Guild, Role};
use serenity::model::user::{OnlineStatus, User};
```
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