Add helper to reduce base-model boilerplate per #2637

peewee.py

@@ -474,6 +474,10 @@ def transaction(self, *args, **kwargs):
         return _transaction(self, *args, **kwargs)
     def savepoint(self):
         return _savepoint(self)
+    @property
+    def Model(self):
+        class Meta: database = self
+        return type('BaseModel', (Model,), {'Meta': Meta})
 
 
 class ModelDescriptor(object): pass
@@ -3449,6 +3453,11 @@ def bind_ctx(self, models, bind_refs=True, bind_backrefs=True):
     def get_noop_select(self, ctx):
         return ctx.sql(Select().columns(SQL('0')).where(SQL('0')))
 
+    @property
+    def Model(self):
+        class Meta: database = self
+        return type('BaseModel', (Model,), {'Meta': Meta})
+
 
 def __pragma__(name):
     def __get__(self):

tests/db_tests.py

@@ -921,3 +921,24 @@ def test_exception_wrapper(self):
 
         if exc is None: raise Exception('expected integrity error not raised')
         self.assertTrue(exc.orig.__module__ != 'peewee')
+
+
+class TestModelPropertyHelper(BaseTestCase):
+    def test_model_property(self):
+        database = get_in_memory_db()
+        class M1(database.Model): pass
+        class M2(database.Model): pass
+        class CM1(M1): pass
+        for M in (M1, M2, CM1):
+            self.assertTrue(M._meta.database is database)
+
+    def test_model_property_on_proxy(self):
+        db = DatabaseProxy()
+        class M1(db.Model): pass
+        class M2(db.Model): pass
+        class CM1(M1): pass
+
+        test_db = get_in_memory_db()
+        db.initialize(test_db)
+        for M in (M1, M2, CM1):
+            self.assertEqual(M._meta.database.database, ':memory:')