DIYgod/RSSHub · warning · InvalidParameterError

Unsupported model: ${model}

Error message

Unsupported model: ${model}

What it means

processFeed dispatches on a model string ('channel', 'tags', 'author') via a switch. The default branch throws InvalidParameterError for any other model value. This is an internal routing error: model comes from the route definition, not (usually) directly from user input, so an unsupported model means a route was wired to processFeed with an unhandled model.

Source

Thrown at lib/routes/theinitium/utils.ts:239

            break;
        }
        case 'tags': {
            const tagSlug = language ? applyLanguageToTagSlug(type, language) : type;
            filter = `tag:${tagSlug}`;
            listLink = `https://theinitium.com/tag/${type}/`;
            feedName = type;
            break;
        }
        case 'author': {
            // Author slugs also have -zh-hans suffixed versions for simplified Chinese
            const authorSlug = language === 'zh-hans' ? `${type}-zh-hans` : type;
            filter = `author:${authorSlug}`;
            listLink = `https://theinitium.com/author/${type}/`;
            feedName = type;
            break;
        }
        default:
            throw new InvalidParameterError(`Unsupported model: ${model}`);
    }

    const cacheKey = `theinitium:ghost:${model}:${type}:${language}`;
    // Use routeExpire (5 min default) and refresh=false so cache actually expires
    const data = (await cache.tryGet(
        cacheKey,
        async () => {
            const params: Record<string, string> = {
                include: 'tags,authors',
                limit: '20',
            };
            if (filter) {
                params.filter = filter;
            }
            return await ghostFetch('posts', params);
        },
        config.cache.routeExpire,
        false

View on GitHub (pinned to bed535e087)

Solutions

  1. Add a case in processFeed's switch for the new model, or route the new subscription through an existing model.
  2. Ensure every route that calls processFeed passes one of the supported model literals.
  3. Make the model a union type (type Model = 'channel'|'tags'|'author') so TypeScript flags invalid callers at compile time.

Example fix

// before
switch (model) {
    case 'channel': ...
    case 'tags': ...
    case 'author': ...
    default: throw new InvalidParameterError(`Unsupported model: ${model}`);
}

// after: narrow with a union type so invalid models are a compile error
type FeedModel = 'channel' | 'tags' | 'author';
export const processFeed = async (model: FeedModel, ctx: Context) => {
    switch (model) {
        case 'channel': ...
        case 'tags': ...
        case 'author': ...
    }
};
Defensive patterns

Strategy: type-guard

Validate before calling

type FeedModel = 'channel' | 'tags' | 'author';
const SUPPORTED_MODELS = new Set<FeedModel>(['channel', 'tags', 'author']);
function isFeedModel(m: string): m is FeedModel {
    return SUPPORTED_MODELS.has(m as FeedModel);
}
// only call processFeed when isFeedModel(model)

Type guard

function isFeedModel(m: string): m is 'channel' | 'tags' | 'author' {
    return m === 'channel' || m === 'tags' || m === 'author';
}

Try / catch

try {
    return await processFeed(model, ctx);
} catch (e) {
    if (e instanceof InvalidParameterError && /Unsupported model/.test(e.message)) {
        // this is a programmer error; surface it loudly in logs
        throw new Error(`Route wired to processFeed with bad model "${model}"`);
    }
    throw e;
}

Prevention

When it happens

Trigger: A theinitium route registers with a model not in {channel, tags, author} (e.g. 'topic' or 'section') and routes to processFeed; the switch falls through to default.

Common situations: Adding a new subscription type and forgetting to add its case to the switch; refactoring route definitions and changing the model string; copy-paste route wiring that passes a wrong literal.

Related errors

AI-assisted analysis of DIYgod/RSSHub@bed535e087 (2026-08-12). Data as JSON: /api/errors/ca79e0c66a17a346. Report an issue: GitHub.