- You can use getSelect() to retrieve the current collection db select with all the filters applied. You can just tweak it by resetting the columns part and specifying the model’s id field instead
- Yes, you can use getAllIds() that will return all model id field values
Yes, you can use getModelIds() that will return all model id field valuesNo, it is impossible
Отсюда тупой индус скопировал, бля… magento.stackexchange.com/questions/9105