Method linkFilesToChat

coderd/exp_chats.go:6353–6379

linkFilesToChat inserts file-link rows into the chat_file_links join table. Cap enforcement and dedup are handled atomically in SQL. On success returns (nil, false). On failure returns the full input fileIDs slice — linking is all-or-nothing because the SQL operates on the batch atomically. capExcee

(ctx context.Context, chatID uuid.UUID, fileIDs []uuid.UUID)

// or a database error (false).
// Failures are logged but never block the caller.
func (api *API) linkFilesToChat(ctx context.Context, chatID uuid.UUID, fileIDs []uuid.UUID) (unlinked []uuid.UUID, capExceeded bool) {
	if len(fileIDs) == 0 {
		return nil, false
	}
	rejected, err := api.Database.LinkChatFiles(ctx, database.LinkChatFilesParams{
		ChatID:       chatID,
		MaxFileLinks: int32(codersdk.MaxChatFileIDs),
		FileIds:      fileIDs,
	})
	if err != nil {
		api.Logger.Error(ctx, "failed to link files to chat",
			slog.F("chat_id", chatID),
			slog.F("file_ids", fileIDs),
			slog.Error(err),
		)
		return fileIDs, false
	}
	if rejected > 0 {
		api.Logger.Warn(ctx, "file cap reached, files not linked",
			slog.F("chat_id", chatID),
			slog.F("file_ids", fileIDs),
			slog.F("max_file_links", codersdk.MaxChatFileIDs),
		)
		return fileIDs, true
	}
	return nil, false
}

// fileLinkCapWarning builds a user-facing warning when a batch
// of file IDs was atomically rejected because the resulting