letterSchema.virtual('vObj_department', {
ref: 'Department',
localField: 'LOC_ID LET_DEP_ID',
foreignField: 'LOC_ID DEP_ID',
justOne: true,
})
Both the Letter and the Department schemas have a LOC_ID variable. I wish to join these two schemas in a populate only if both their LOC_ID matches, and LET_DEP_ID == DEP_ID. Is this possible? If not, any work-arounds?
