Update a measurement

datastore/measurements.go

@@ -46,3 +46,26 @@ func (s *measurementsStore) List(opt *models.MeasurementListOptions) ([]*models.
 	}
 	return measurements, nil
 }
+
+func (s *measurementsStore) Update(id int64, measurement *models.Measurement) (bool, error) {
+	_, err := s.Get(id)
+	if err != nil {
+		return false, err
+	}
+
+	if id != measurement.Id {
+		return false, models.ErrMeasurementNotFound
+	}
+
+	measurement.UpdatedAt = time.Now()
+	changed, err := s.dbh.Update(measurement)
+	if err != nil {
+		return false, err
+	}
+
+	if changed == 0 {
+		return false, ErrNoRowsUpdated
+	}
+
+	return true, nil
+}

datastore/measurements_test.go

@@ -98,3 +98,23 @@ func TestMeasurementsStore_List_db(t *testing.T) {
 		t.Errorf("got measurements %+v, want %+v", measurements, want)
 	}
 }
+
+func TestMeasurementsStore_Update_db(t *testing.T) {
+	tx, _ := DB.Begin()
+	defer tx.Rollback()
+
+	measurement := insertMeasurement(t, tx)
+
+	d := NewDatastore(tx)
+
+	// Tweak it
+	measurement.MeasurementValue = sql.NullFloat64{Float64: 4.56, Valid: true}
+	updated, err := d.Measurements.Update(measurement.Id, measurement)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if !updated {
+		t.Error("!updated")
+	}
+}