Put the database configuration asinstance attribute of EmComponent

Database/sqlutils.py

 import sqlalchemy as sqla
 from django.conf import settings
 
+import EditorialModel
 
 os.environ.setdefault("DJANGO_SETTINGS_MODULE", "Lodel.settings")
 
 # @param cls : An EmComponent child class
 # @return An sqlalchemy table
 # @throw TypeError if em_instance is an EmComponent  or not an EmComponent child class (or an instance)
-def get_table(cls):
-    from EditorialModel.components import EmComponent  # dirty circula inclusion hack
-    if not issubclass(cls, EmComponent) or cls.table is None:
-        raise TypeError("Excepting an EmComponent child class not an " + str(cls))
-    engine = cls.db_engine()
-    return sqla.Table(cls.table, meta(engine))
-
-
-def getTable(cls):
-    return get_table(cls)
-
+# @todo Move this function as an instance method ?
+def get_table(self):
+    if not issubclass(self.__class__, EditorialModel.components.EmComponent) or self.table is None:
+        raise TypeError("Excepting an EmComponent child class not an " + str(self.__class__))
+    engine = self.db_engine
+    return sqla.Table(self.table, meta(engine))
 
 ## This function is intended to execute ddl defined in sqlalter
 # @warning There is a dirty workaround here, DDL should returns only one query, but DropColumn for sqlite has to return 4 queries (rename, create, insert, drop). There is a split on the compiled SQL to extract and execute one query at a time

EditorialModel/classes.py

         #Create a new entry in the em_class table
         result = super(EmClass, cls).create(name=name, classtype=classtype, icon=icon, sortcolumn=sortcolumn, **em_component_args)
 
-        dbe = result.db_engine()
+        dbe = result.db_engine
         conn = dbe.connect()
 
         #Create a new table storing LodelObjects of this EmClass
             do_delete = False
             return False
 
-        dbe = self.__class__.db_engine()
+        dbe = self.db_engine
         meta = sqlutils.meta(dbe)
         #Here we have to give a connection
         class_table = sql.Table(self.name, meta)
     ## Isolate SQL for EmClass::fieldgroups
     # @return An array of dict (sqlalchemy fetchall)
     def _fieldgroups_db(self):
-        dbe = self.__class__.db_engine()
+        dbe = self.db_engine
         emfg = sql.Table(EditorialModel.fieldgroups.EmFieldGroup.table, sqlutils.meta(dbe))
         req = emfg.select().where(emfg.c.class_id == self.uid)
 
     ## Isolate SQL for EmCLass::types
     # @return An array of dict (sqlalchemy fetchall)
     def _types_db(self):
-        dbe = self.__class__.db_engine()
+        dbe = self.db_engine
         emtype = sql.Table(EditorialModel.types.EmType.table, sqlutils.meta(dbe))
         req = emtype.select().where(emtype.c.class_id == self.uid)
         conn = dbe.connect()
 
     def _link_type_db(self, table_name):
         #Create a new table storing LodelObjects that are linked to this EmClass
-        conn = self.__class__.db_engine().connect()
+        conn = self.db_engine.connect()
         meta = sql.MetaData()
         emlinketable = sql.Table(table_name, meta, sql.Column('uid', sql.VARCHAR(50), primary_key=True))
         emlinketable.create(conn)
         return self._linked_types_db()
 
     def _linked_types_db(self):
-        dbe = self.__class__.db_engine()
+        dbe = self.db_engine
         meta = sql.MetaData()
         meta.reflect(dbe)
 

EditorialModel/components.py

     # @param id_or_name int|str: name or id of the object
     # @throw TypeError if id_or_name is not an integer nor a string
     # @throw NotImplementedError if called with EmComponent
-    def __init__(self, id_or_name):
+    def __init__(self, id_or_name, dbconf = 'default'):
+        
+        self.dbconf = dbconf
+        if self.dbconf:
+            self.db_engine = sqlutils.get_engine(dbconf)
+        else:
+            self.db_engine = False
+
         if type(self) == EmComponent:
             raise NotImplementedError('Abstract class')
 
 
         super(EmComponent, self).__setattr__('deleted', False)
 
-    @classmethod
+    #@classmethod
     ## Shortcut that return the sqlAlchemy engine
-    def db_engine(cls):
-        return sqlutils.get_engine(cls.dbconf)
+    #def db_engine(cls):
+    #    return sqlutils.get_engine(cls.dbconf)
 
     ## Do the query on the database for EmComponent::populate()
     # @throw EmComponentNotExistError if the instance is not anymore stored in database
     def _populate_db(self):
-        dbe = self.__class__.db_engine()
+        dbe = self.db_engine
         component = sql.Table(self.table, sqlutils.meta(dbe))
         req = sql.sql.select([component])
 
     ## Insert a new component in the database
     #
     # This function create and assign a new UID and handle the date_create and date_update values
-    #
+    # @warning There is a mandatory argument dbconf that indicate wich database configuration to use
     # @param **kwargs : Names arguments representing object properties
     # @return An instance of the created component
     # @throw TypeError if an element of kwargs isn't a valid object propertie or if a mandatory argument is missing
         #    if cls._fields[name].notNull and cls._fields[name].default == None:
         #        raise TypeError("Missing argument : "+name)
 
+        if 'dbconf' in kwargs:
+            if not kwargs['db_engine']:
+                raise NotImplementedError("Its a nonsense to call create with no database")
+            dbconf = kwargs['dbconf']
+        else:
+            dbconf = 'default'
+        dbe = sqlutils.get_engine(dbconf)
 
-        kwargs['uid'] = cls.new_uid()
+        kwargs['uid'] = cls.new_uid(dbe)
         kwargs['date_update'] = kwargs['date_create'] = datetime.datetime.utcnow()
 
-        dbe = cls.db_engine()
         conn = dbe.connect()
 
-        kwargs['rank'] = cls.get_max_rank( kwargs[cls.ranked_in] )+1
+        kwargs['rank'] = cls._get_max_rank( kwargs[cls.ranked_in], dbe )+1
 
         table = sql.Table(cls.table, sqlutils.meta(dbe))
         req = table.insert(kwargs)
         if not conn.execute(req):
             raise RuntimeError("Unable to create the "+cls.__class__.__name__+" EmComponent ")
         conn.close()
-        return cls(kwargs['name'])
+        return cls(kwargs['name'], dbconf)
 
     ## Write the representation of the component in the database
     # @return bool
     # @throw RunTimeError if it was unable to do the Db update
     def _save_db(self, values):
         """ Do the query on the db """
-        dbe = self.__class__.db_engine()
+        dbe = self.db_engine
         component = sql.Table(self.table, sqlutils.meta(dbe))
         req = sql.update(component, values=values).where(component.c.uid == self.uid)
 
     # @throw RunTimeError if it was unable to do the deletion
     def delete(self):
         #<SQL>
-        dbe = self.__class__.db_engine()
+        dbe = self.db_engine
         component = sql.Table(self.table, sqlutils.meta(dbe))
         req = component.delete().where(component.c.uid == self.uid)
         conn = dbe.connect()
         super(EmComponent, self).__setattr__('deleted', True)
         return True
 
-    ## get_max_rank
-    # Retourne le rank le plus élevé pour le groupe de component au quel apartient l'objet actuelle
+    ## @brief Get the maximum rank given an EmComponent child class and a ranked_in filter
     # @param ranked_in_value mixed: The rank "family"
-    # @param return -1 if no EmComponent found else return an integer >= 0
+    # @return -1 if no EmComponent found else return an integer >= 0
     @classmethod
-    def get_max_rank(cls, ranked_in_value):
-        dbe = cls.db_engine()
+    def _get_max_rank(cls, ranked_in_value, dbe):
         component = sql.Table(cls.table, sqlutils.meta(dbe))
         req = sql.sql.select([component.c.rank]).where(getattr(component.c, cls.ranked_in) == ranked_in_value).order_by(component.c.rank.desc())
         c = dbe.connect()
         else:
             return -1
 
+    ## Only make a call to the class method
+    # @return A positive integer or -1 if no components
+    # @see EmComponent::_get_max_rank()
+    def get_max_rank(self, ranked_in_value):
+        return self.__class__._get_max_rank(ranked_in_value, self.db_engine)
+
     ## Set a new rank for this component
     # @note This function assume that ranks are properly set from 1 to x with no gap
     # @param new_rank int: The new rank
         limits = [ self.rank + ( 1 if mod > 0 else -1), new_rank ] #The range of modified ranks
         limits.sort()
 
-        dbe = self.db_engine()
+        dbe = self.db_engine
         conn = dbe.connect()
-        table = sqlutils.get_table(self.__class__)
+        table = sqlutils.get_table(self)
 
         #Selecting the components that will be modified
         req = table.select().where( getattr(table.c, self.ranked_in) == getattr(self, self.ranked_in)).where(table.c.rank >= limits[0]).where(table.c.rank <= limits[1])
     #
     # Use the class property table
     # @return A new uid (an integer)
-    def new_uid(cls):
+    def new_uid(cls, db_engine):
         if cls.table is None:
             raise NotImplementedError("Abstract method")
 
-        dbe = cls.db_engine()
+        dbe = db_engine
 
         uidtable = sql.Table('uids', sqlutils.meta(dbe))
         conn = dbe.connect()

EditorialModel/fieldgroups.py

 import EditorialModel.fieldtypes as ftypes
 
 from Database import sqlutils
+import sqlalchemy as sql
 
 import EditorialModel
 
     ## Get the list of associated fields
     # @return A list of EmField instance
     def fields(self):
-        field_table = sqlutils.getTable(EditorialModel.fields.EmField)
+        meta = sqlutils.meta(self.db_engine)
+        field_table = sql.Table(EditorialModel.fields.EmField.table, meta)
         req = field_table.select(field_table.c.uid).where(field_table.c.fieldgroup_id == self.uid)
-        conn = self.__class__.db_engine().connect()
+        conn = self.db_engine.connect()
         res = conn.execute(req)
         rows = res.fetchall()
         conn.close()

EditorialModel/fields.py

     # @return bool : True if deleted False if deletion aborded
     # @todo Check if unconditionnal deletion is correct
     def delete(self):
-        dbe = self.__class__.db_engine()
+        dbe = self.db_engine
         class_table = sql.Table(self.get_class_table(), sqlutils.meta(dbe))
         field_col = sql.Column(self.name)
         ddl = DropColumn(class_table, field_col)
-        sqlutils.ddl_execute(ddl, self.__class__.db_engine())
+        sqlutils.ddl_execute(ddl, self.db_engine)
         return super(EmField, self).delete()
 
     ## add_field_column_to_class_table (Function)
     # @param emField EmField: the object representing the field
     # @return True in case of success, False if not
     def add_field_column_to_class_table(self):
-        dbe = self.db_engine()
+        dbe = self.db_engine
         fieldtype = get_field_type(self.fieldtype)
         new_column = sql.Column(name=self.name, **(fieldtype.sqlalchemy_args()) )
         class_table = sql.Table(self.get_class_table(), sqlutils.meta(dbe))
     # @return An EmClass instance
     def get_class(self):
         #<SQL>
-        dbe = self.db_engine()
+        dbe = self.db_engine
+        meta = sqlutils.meta(dbe)
         conn = dbe.connect()
-        fieldgroup_table = sqlutils.getTable(EmFieldGroup)
+        fieldgroup_table = sql.Table(EmFieldGroup.table, meta)
         req = fieldgroup_table.select().where(fieldgroup_table.c.uid == self.fieldgroup_id)
         res = conn.execute(req)
         row = res.fetchone()

EditorialModel/test/test_component.py

     def test_newuid(self):
         """ Test valid calls for new_uid method """
         for _ in range(10):
-            nuid = EmTestComp.new_uid()
+            nuid = EmTestComp.new_uid(self.dber)
         
             conn = self.dber.connect()
             tuid = sqla.Table('uids', sqlutils.meta(self.dber))
     def test_newuid_abstract(self):
         """ Test not valit call for new_uid method """
         with self.assertRaises(NotImplementedError):
-            EmComponent.new_uid()
+            EmComponent.new_uid(self.dber)
         pass
         
 #=======================#
         pass
 
     def testGetMaxRank(self):
-        old = EmTestComp.get_max_rank('f')
+        old = EmTestComp._get_max_rank('f', self.dber)
         EmTestComp.create(name="foobartest", rank_fam = 'f')
-        n = EmTestComp.get_max_rank('f')
+        n = EmTestComp._get_max_rank('f', self.dber)
         self.assertEqual(old+1, n, "Excepted value was "+str(old+1)+" but got "+str(n))
-        self.assertEqual(EmTestComp.get_max_rank('z'), -1)
+        self.assertEqual(EmTestComp._get_max_rank('z', self.dber), -1)
         pass
 
 #====================#

EditorialModel/test/test_field.py

     # @param field EmField: EmField object
     # @return Number of found records
     def _get_field_records_Db(self,field):
-        dbe = EmComponent.db_engine()
+        dbe = field.db_engine
         fieldtable = sqla.Table(EmField.table, sqlutils.meta(dbe))
         conn = dbe.connect()
         req = fieldtable.select().where(fieldtable.c.uid==field.uid).where(fieldtable.c.name==field.name)
     # @param table_name str: Name of the table
     # @return list of columns
     def _get_table_columns_Db(self, table_name):
-        table = sqla.Table(table_name, sqlutils.meta(EmComponent.db_engine()))
+        dbe = self.testClass.db_engine
+        table = sqla.Table(table_name, sqlutils.meta(dbe))
         return table.c
 
 ## TestField (Class)

EditorialModel/test/test_fieldgroups.py

 
     def setUp(self):
         super(TestInit, self).setUp()
+        dbe = sqlutils.get_engine()
         conn = sqlutils.get_engine().connect()
 
         ent1 = EmClass('entity1')
         self.creadate = datetime.datetime.utcnow()
         #Test fieldgroup
         self.tfg = [
-            { 'uid': EmFieldGroup.new_uid(), 'name': 'fg1', 'string': '{"fr":"Super Fieldgroup"}', 'help': '{"en":"help"}', 'rank': 0 , 'class_id': ent1.uid, 'date_create' : self.creadate, 'date_update': self.creadate},
-            { 'uid': EmFieldGroup.new_uid(), 'name': 'fg2', 'string': '{"fr":"Super Fieldgroup"}', 'help': '{"en":"help"}', 'rank': 1 , 'class_id': ent1.uid, 'date_create': self.creadate, 'date_update': self.creadate},
-            { 'uid': EmFieldGroup.new_uid(), 'name': 'fg3', 'string': '{"fr":"Super Fieldgroup"}', 'help': '{"en":"help"}', 'rank': 2 , 'class_id': idx1.uid, 'date_create': self.creadate, 'date_update': self.creadate},
+            { 'uid': EmFieldGroup.new_uid(dbe), 'name': 'fg1', 'string': '{"fr":"Super Fieldgroup"}', 'help': '{"en":"help"}', 'rank': 0 , 'class_id': ent1.uid, 'date_create' : self.creadate, 'date_update': self.creadate},
+            { 'uid': EmFieldGroup.new_uid(dbe), 'name': 'fg2', 'string': '{"fr":"Super Fieldgroup"}', 'help': '{"en":"help"}', 'rank': 1 , 'class_id': ent1.uid, 'date_create': self.creadate, 'date_update': self.creadate},
+            { 'uid': EmFieldGroup.new_uid(dbe), 'name': 'fg3', 'string': '{"fr":"Super Fieldgroup"}', 'help': '{"en":"help"}', 'rank': 2 , 'class_id': idx1.uid, 'date_create': self.creadate, 'date_update': self.creadate},
         ]
 
         req = sqla.Table('em_fieldgroup', sqlutils.meta(sqlutils.get_engine())).insert(self.tfg)

EditorialModel/types.py

     # @return sqlalchemy em_type_hierarchy table object
     # @todo Don't hardcode table name
     def _table_hierarchy(self):
-        return sql.Table(self.__class__.table_hierarchy, sqlutils.meta(self.db_engine()))
+        return sql.Table(self.__class__.table_hierarchy, sqlutils.meta(self.db_engine))
 
     @property
     ## Return the EmClassType of the type
     ## Get the list of associated fieldgroups
     # @return A list of EmFieldGroup instance
     def field_groups(self):
-        fg_table = sqlutils.getTable(EmFieldGroup)
+        meta = sqlutils.meta(self.db_engine)
+        fg_table = sql.Table(EmFieldGroup.table, meta)
         req = fg_table.select(fg_table.c.uid).where(fg_table.c.class_id == self.class_id)
-        conn = self.__class__.db_engine().connect()
+        conn = self.db_engine.connect()
         res = conn.execute(req)
         rows = res.fetchall()
         conn.close()
     ## Return selected optional field
     # @return A list of EmField instance
     def selected_fields(self):
-        dbe = self.db_engine()
+        dbe = self.db_engine
         meta = sqlutils.meta(dbe)
         conn = dbe.connect()
 
         if not field.optional:
             raise ValueError("This field is not optional")
 
-        dbe = self.db_engine()
+        dbe = self.db_engine
         meta = sqlutils.meta(dbe)
         conn = dbe.connect()
 
     # @throw RunTimeError if a nature fetched from db is not valid
     # @see EmType::subordinates(), EmType::superiors()
     def _subOrSup(self, sup = True):
-        conn = self.db_engine().connect()
+        conn = self.db_engine.connect()
         htable = self._table_hierarchy
-        type_table = sqlutils.get_table(self.__class__)
+        type_table = sqlutils.get_table(self)
 
         req = htable.select()
         if sup:
         elif self.name != em_type.name:
             raise ValueError("Not allowed to put a different em_type as superior in a relation of nature '"+relation_nature+"'")
 
-        conn = self.db_engine().connect()
+        conn = self.db_engine.connect()
         htable = self._table_hierarchy
         values = { 'subordinate_id': self.uid, 'superior_id': em_type.uid, 'nature': relation_nature }
         req = htable.insert(values=values)
         if relation_nature not in EmClassType.natures(self.classtype['name']):
             raise ValueError("Invalid nature for add_superior : '"+relation_nature+"'. Allowed relations for this type are "+str(EmClassType.natures(self.classtype['name'])))
 
-        conn = self.db_engine().connect()
+        conn = self.db_engine.connect()
         htable = self._table_hierarchy
         req = htable.delete(htable.c.superior_id == em_type.uid and htable.c.nature == relation_nature)
         conn.execute(req)
     ## @brief Return the list of all the types linked to this type, should they be superiors or subordinates
     # @return A list of EmType objects
     def _linked_types_Db(self):
-        conn = self.db_engine().connect()
+        conn = self.db_engine.connect()
         htable = self._table_hierarchy
         req = htable.select(htable.c.superior_id, htable.c.subordinate_id)
         req = req.where(sql.or_(htable.c.subordinate_id == self.uid, htable.c.superior_id == self.uid))