blurrcat · August 29, 2015 14:05 · Aug 24, 2014 · Aug 24, 2014
diff --git a/app.py b/app.py
@@ -1,8 +1,7 @@
 from flask import Flask
-from models import Base
-
-
-app = Flask('tets')
-
-
+from db import db
 
+def create_app(config_obj)
+    app = Flask('tets')
+    app.config.fromobj(config_obj)  # db configured in `config_obj`
+    db.init_app(app)
diff --git a/db.py b/db.py
@@ -1,5 +1,3 @@
-#!/usr/bin/env python
-# -*- coding: utf-8 -*-
 from flask_peewee.db import Database
 from peewee import Model
 
@@ -23,3 +21,6 @@ class Meta:
             database = self.database
 
         self.Model.Meta = Meta
+
+
+db = DeferredDatabase()
diff --git a/models.py b/models.py
@@ -1,7 +1,9 @@
-# database irrelevant model definitions
+# database engine irrelevant model definitions
+# i.e., you can define models before connecting to the database
+from db import db
 
 
-class User(Base):
+class User(db.Model):
     class Meta:
         db_table = 'test_user'
     name = CharField()
diff --git a/app.py b/app.py
@@ -0,0 +1,8 @@
+from flask import Flask
+from models import Base
+
+
+app = Flask('tets')
+
+
+
diff --git a/db.py b/db.py
@@ -0,0 +1,25 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+from flask_peewee.db import Database
+from peewee import Model
+
+
+class DeferredDatabase(Database):
+    def __init__(self, app=None):
+        if app:
+            super(DeferredDatabase, self).__init__(app)
+        else:
+            class BaseModel(Model):
+                pass
+            self.Model = BaseModel
+
+    def init_app(self, app):
+        self.app = app
+
+        self.load_database()
+        self.register_handlers()
+
+        class Meta:
+            database = self.database
+
+        self.Model.Meta = Meta
diff --git a/models.py b/models.py
@@ -0,0 +1,7 @@
+# database irrelevant model definitions
+
+
+class User(Base):
+    class Meta:
+        db_table = 'test_user'
+    name = CharField()