get type name of struct.

turn ToggleActive to toggleActive.

count records, using WHERE business_id = ? AND $condition business_id can be blank for admin user.

returns slice removing duplicate elements.

turn salesInvoice to SalesInvoice.

check if id exists, using ctx's business_id in WHERE, return RecordNOtFound Error.

check if ALL id exists, using ctx's business_id in WHERE, return RecordNOtFound Error.