# 07 — Naming Conventions

All new code must follow these conventions. Consistent naming is how the codebase communicates intent without comments.

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## Files

| Context | Convention | Examples |
|---|---|---|
| Python source files | `snake_case.py` | `download.py`, `qbittorrent.py`, `package.py` |
| New domain files under `app/api/endpoints/`, `app/chain/`, `app/helper/`, `app/utils/` | Single noun `snake_case.py`; prefer an existing domain file before adding a new one | `package.py`, `plugin.py`, `torrent.py` |
| Module package directories | `snake_case/` | `qbittorrent/`, `synologychat/` |
| Test files | `test_<domain>.py` | `test_download_chain.py`, `test_subscribe_endpoint.py` |
| Alembic migrations | Auto-generated by Alembic; do not rename | `20240101_add_column.py` |
| Skill directories | `<kebab-case>/` | `transfer-failed-retry/`, `moviepilot-cli/` |

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## Classes

| Context | Convention | Examples |
|---|---|---|
| Chain classes | `<Domain>Chain` | `DownloadChain`, `SearchChain`, `SubscribeChain` |
| Module classes | `<Backend>Module` | `QbittorrentModule`, `EmbyModule`, `TelegramModule` |
| Oper (data access) classes | `<Model>Oper` | `SubscribeOper`, `SystemConfigOper`, `TransferHistoryOper` |
| Helper classes | `<Domain>Helper` | `TorrentHelper`, `DirectoryHelper`, `MessageHelper` |
| Pydantic schema models | `PascalCase`, noun-focused | `MediaInfo`, `TorrentInfo`, `DownloadingTorrent` |
| SQLAlchemy model classes | `PascalCase`, singular noun | `Subscribe`, `TransferHistory`, `SystemConfig` |
| Enum classes | `PascalCase` | `MediaType`, `EventType`, `ModuleType` |
| Manager classes | `<Domain>Manager` | `ModuleManager`, `PluginManager`, `EventManager` |
| General classes | `PascalCase` | `MetaInfo`, `Context`, `ChainBase` |

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## Functions and Methods

| Context | Convention | Examples |
|---|---|---|
| All functions and methods | `snake_case` | `get_subscribe`, `run_module`, `on_config_changed` |
| Private methods | `_snake_case` (leading underscore) | `_submit_download_added_task`, `_parse_result` |
| Event handler methods | `on_<event_name>` or descriptive | `on_transfer_complete`, `handle_config_changed` |
| Module interface methods | Match `_ModuleBase` contract | `init_module`, `init_setting`, `get_name`, `get_type`, `test`, `stop` |
| Oper methods | Verb + noun | `get`, `add`, `update`, `delete`, `list` |

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## Variables and Parameters

| Context | Convention | Examples |
|---|---|---|
| Local variables | `snake_case` | `torrent_info`, `media_type`, `download_dir` |
| Instance attributes | `snake_case` | `self.download_history`, `self.config` |
| Constants (module-level) | `UPPER_SNAKE_CASE` | `DEFAULT_EVENT_PRIORITY`, `MIN_EVENT_CONSUMER_THREADS` |
| Private variables | `_snake_case` (leading underscore) | `_instance`, `_lock` |
| Type variables | `PascalCase` with `TypeVar` | `T = TypeVar("T")` |

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## Enums

| Context | Convention | Examples |
|---|---|---|
| Enum class name | `PascalCase` | `MediaType`, `TorrentStatus`, `EventType` |
| Enum members | `PascalCase` (for complex enums) | `MediaType.MOVIE`, `EventType.TransferComplete` |
| String enum values | Match the domain language | `MediaType.MOVIE = '电影'`, `TorrentStatus.TRANSFER = '可转移'` |
| `SystemConfigKey` values | Match the config key as a string | `SystemConfigKey.RssUrls = "RssUrls"` |

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## Configuration and Settings

| Context | Convention | Examples |
|---|---|---|
| `Settings` / `ConfigModel` fields | `UPPER_SNAKE_CASE` | `API_TOKEN`, `LLM_MODEL`, `QB_HOST` |
| `SystemConfigKey` enum members | `PascalCase` | `SystemConfigKey.RssUrls`, `SystemConfigKey.SubscribeFilter` |
| Environment variable names | `UPPER_SNAKE_CASE` | `AI_AGENT_ENABLE`, `DB_TYPE` |

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## API Endpoints and Routers

| Context | Convention | Examples |
|---|---|---|
| Endpoint function names | `snake_case`, verb-first | `get_subscribe_list`, `add_download`, `delete_history` |
| URL path segments | `kebab-case` or `snake_case` matching existing patterns | `/api/v1/subscribe`, `/api/v1/transfer/history` |
| Router tags | Match the resource domain name | `"subscribe"`, `"download"`, `"media"` |

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## Anti-Patterns

| Wrong | Correct |
|---|---|
| `class downloadchain:` | `class DownloadChain:` |
| `class QBModule:` | `class QbittorrentModule:` |
| `def GetSubscribe():` | `def get_subscribe():` |
| `TORRENT_info = ...` | `torrent_info = ...` |
| `def handleConfigChanged():` | `def on_config_changed():` or `def handle_config_changed():` |
| `SystemConfigOper().get("RssUrls")` | `SystemConfigOper().get(SystemConfigKey.RssUrls)` |
| `class subscribe_oper:` | `class SubscribeOper:` |

*Last Updated: 2026-06-23*
