refactor(data): move islolation_level to the data source root

Now the islolation_level configuration item will be at the data
source root level

Fixes: #447

examples/testapp/app.py

@@ -68,10 +68,10 @@ def initialize(self):
         data_source_conf = {
             'connector': "sqlalchemy",
             'url': "mysql+pymysql://root@localhost:3306/test",
+            # 'isolation_level': 'REPEATABLE READ',
             'pool': {
                 'size': 10,
                 'max_overflow': 10,
-                # 'isolation_level': 'REPEATABLE READ',
                 # 'pool_recycle': 400
             }
         }
@@ -85,7 +85,7 @@ def initialize(self):
     def install(self):
         """  Installing test database
         """
-        from firenado.util.sqlalchemy_util import Base
+        from testapp.models import Base
         print('Installing Testapp App...')
         print('Creating App ...')
         engine = self.application.get_data_source(

examples/testapp/services.py

@@ -72,5 +72,3 @@ def is_valid(self, username, password):
             if user.password == password_digest(password):
                 return True
         return False
-
-

firenado/data.py

@@ -161,7 +161,6 @@ def configure(self, name, conf):
         # We will set the isolation level to READ UNCOMMITTED by default
         # to avoid the "cache" effect sqlalchemy has without this option.
         # Solution from: http://bit.ly/2bDq0Nv
-        # TODO: Get the isolation level from data source conf
         engine_params = {
             'isolation_level': "READ UNCOMMITTED"
         }
@@ -176,15 +175,16 @@ def configure(self, name, conf):
             if conf['future']:
                 engine_params['future'] = True
 
+        if "isolation_level" in conf:
+            if conf['isolation_level']:
+                engine_params['isolation_level'] = conf['isolation_level']
+
         if "pool" in conf:
             if "class" in conf['pool']:
                 engine_params['pool_class'] = conf['pool']['class']
                 if isinstance(engine_params['pool_class'], str):
                     engine_params['pool_class'] = config.get_from_string(
                         engine_params['pool_class'])
-            if "isolation_level" in conf['pool']:
-                engine_params['isolation_level'] = conf['pool'][
-                    'isolation_level']
             if "max_overflow" in conf['pool']:
                 engine_params['max_overflow'] = conf['pool']['max_overflow']
             if "pool_recycle" in conf['pool']: