多个包含ActiveRecord Rails的where子句

Question

I have two tables "patients" and "patient_funds"

patient:
id   status
1    active
2    active
3    inactive

patient_funds:
id    required    allocated   patient_id
1     10             5            1
2     10             10           2

I want to select 'active' patients having required = allocated from "patient_funds". i,e I want "patient_funds" with id 2 to be selected. How can I do it using include .

I tried something like

Patient.includes(:patient_funds).where(status: "active")

I want to add another condition on "patient_funds" table as I explained. Something like

required LIKE allocated

Answer 1

When you use includes it just pulls data alongside your request to prevent N+1 query.

What you need is join

Patient.joins(:patient_funds).where("patients.status = 'active' AND patient_funds.allocated > ?", 6)
# for example

This will get all patients that have patient_funds and allocated > 6