查询具有数组数据类型的Rails Postgres

Question

So, Ive been trying to query my PostgreSQL model in Rails, but get the following error:

undefined method `id' for TransactionTemplate::ActiveRecord_Relation

My code:

    @transaction_templates = TransactionTemplate.where("transaction_category_id = 1")
    @transaction = Transaction.where("transaction_template_id in (?)", @transaction_templates.id)

I know that the transaction templates is an array and that there is therefor not just one ID it needs to look up, but multiple of IDs, just as I want it.

Any suggestions?

Answer 1

Try this:

@transaction_templates = TransactionTemplate.where("transaction_category_id = 1")
@transaction = Transaction.where("transaction_template_id in (?)", @transaction_templates.map(&:id))

Answer 2

If you need just ids then try:

@transaction_template_ids = TransactionTemplate.where("transaction_category_id = 1").pluck(:id)
@transaction = Transaction.where("transaction_template_id in (?)", @transaction_template_ids)

Or you have proper associations then

@transaction = Transaction.joins(:transaction_template).where("transaction_category_id = 1")