wasChanged() {
        if (!this._changed) {
            return true;
        }

        const postMetaChanged = this.relations.posts_meta && this.relations.posts_meta._changed && Object.keys(this.relations.posts_meta._changed).length;

        if (!Object.keys(this._changed).length && !postMetaChanged) {
            return false;
        }

        return true;
    }
If the `formats` option is not used, we return `html` be default.
Otherwise we return what is requested e.g. `?formats=mobiledoc,plaintext`

This method is only used by the raw-knex plugin.
We have moved the logic into the serializers for the API.