Class: Renalware::UKRDC::PatientsQuery

Inherits:
Object
  • Object
show all
Defined in:
app/models/renalware/ukrdc/patients_query.rb

Overview

If the optional :changed_since argument is passed we select all RPV patients how have been updated since that date. Otherwise we select all RPV patients who have changed since the last time they were exported. A patient has a sent_to_ukrdc_at datetime which is the last time the data was actually sent. It maybe be that something about the patient has changed and updated_at > sent_to_ukrdc_at however when compiled to xml there are no effective changes, for example because some notes were added somewhere on the patient’s data but those notes don’t make it into the XML. So therefore no effective changes and we don’t send the file to UKRDC. However a downside of this approach is that we always find updated patients and generate an XML for them, in order to compare an MD5 hash of the XML with what was previously sent, and sometimes this is waste of time if the MD5 hash has not changed. However we will live with this for now I think. If it is a problem we can use the checked_for_ukrdc_changes_at column on patients.

Instance Method Summary collapse

Instance Method Details

#call(changed_since: nil, changed_since_last_send: true) ⇒ Object 



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# File 'app/models/renalware/ukrdc/patients_query.rb', line 21

def call(changed_since: nil, changed_since_last_send: true)
  if changed_since.present?
    # patients who changed since a specific date (inclusive)
    sendable_patients.where("updated_at >= ?", changed_since)
  elsif changed_since_last_send
    # patients who have never been sent, or have changed since the last time they were sent
    sendable_patients.where("(sent_to_ukrdc_at is null) or (updated_at > sent_to_ukrdc_at)")
  else
    sendable_patients
  end
end