closes #21 - error in the select fields

pyheatpump/models/variable.py

     def insert(self):
 
         try:
+            self.type_slabel = self.type.slabel
+
             DB.sql(
             """INSERT INTO variable
             (type, address)
             VALUES
-            (:type, :address)
+            (:type_slabel, :address)
             """, self.__dict__)
             return True
         except Exception as e:
 
     def exists(self):
         try:
+            self.type_slabel = self.type.slabel
+
             return bool(next(DB.sql(
             """SELECT 1 FROM variable
-            WHERE type=:type AND address=:address
+            WHERE type=:type_slabel AND address=:address
             """, self.__dict__)))
         except StopIteration:
             return False
         return {
             row['address']: cast_fct(row['value'])
             for row in DB.sql(
-            """SELECT var.address as address, val.value
+            """SELECT var.address as address, val.value as value
             FROM variable var
             LEFT JOIN var_value val ON
                 var.type = val.type

tests/models/test_variable.py

+#!/usr/bin/env python3
+import pytest
+from datetime import datetime
+from random import choice
+
+from pyheatpump.models.variable import Variable
+
+
+@pytest.fixture
+def rand_vars(set_test_db, var_types):
+    r = []
+    for _, var_type in var_types.items():
+        r.append( Variable(type=var_type,
+            address=choice(range(var_type.start_address, var_type.end_address))))
+    return r
+
+def test_insert(set_test_db, var_types, rand_vars):
+    for var in rand_vars:
+        var.insert()
+
+        assert var.exists()
+
+def test_getall_of_type(set_test_db, var_types):
+    for _, var_type in var_types.items():
+        assert isinstance(Variable.getall_of_type(var_type), dict)
+
+def test_getall(set_test_db):
+    assert isinstance(Variable.getall(), dict)
+
+def test_getall_values_of_type_since(set_test_db, var_types):
+    for _, var_type in var_types.items():
+        assert isinstance(Variable.getall_values_of_type_since(var_type, 0), dict)
+
+def test_getall_values_of_type(set_test_db, var_types):
+    for _, var_type in var_types.items():
+        assert isinstance(Variable.getall_values_of_type_since(var_type, 0), dict)