belongsToMany method
Add a belongsToMany relationship
Implementation
DBHelper belongsToMany(String relatedTable, String pivotTable,
{required String tableId, required String relatedId}) {
_query = "SELECT $table.*,$relatedTable.* FROM $table "
"INNER JOIN $pivotTable ON $pivotTable.$tableId=$table.id "
"INNER JOIN $relatedTable ON $relatedTable.id =$pivotTable.$relatedId";
return this;
}