Merge pull request #101 from squirrelo/data-data_type

add datatype lookup for processed data

qiita_db/data.py

@@ -453,3 +453,16 @@ def preprocessed_data(self):
             "SELECT preprocessed_data_id FROM qiita.{0} WHERE "
             "processed_data_id=%s".format(self._table),
             [self._id])[0]
+
+    @property
+    def data_type(self):
+        r"""The data_type of the data used"""
+        conn_handler = SQLConnectionHandler()
+        sql = ("SELECT DISTINCT DT.data_type FROM qiita.processed_data PD "
+               "JOIN qiita.preprocessed_data PPD on PD.preprocessed_data_id "
+               "= PPD.preprocessed_data_id JOIN qiita.raw_data RD on "
+               "PPD.raw_data_id = RD.raw_data_id "
+               "JOIN qiita.common_prep_info CPI ON RD.raw_data_id = "
+               "CPI.raw_data_id JOIN qiita.data_type DT ON CPI.data_type_id = "
+               "DT.data_type_id WHERE PD.processed_data_id = %s")
+        return conn_handler.execute_fetchone(sql, [self._id])[0]

qiita_db/test/test_data.py

@@ -339,6 +339,10 @@ def test_preprocessed_data(self):
         pd = ProcessedData(1)
         self.assertEqual(pd.preprocessed_data, 1)
 
+    def test_data_type(self):
+        pd = ProcessedData(1)
+        self.assertEqual(pd.data_type, "18S")
+
 
 if __name__ == '__main__':
     main()