Refactoring the code

- Use Flask blueprint
- Split model and views into smaller parts
- Bug fixes
- API adjustment

powerdnsadmin/models/account_user.py

@@ -0,0 +1,17 @@
+from .base import db
+
+
+class AccountUser(db.Model):
+    __tablename__ = 'account_user'
+    id = db.Column(db.Integer, primary_key=True)
+    account_id = db.Column(db.Integer,
+                           db.ForeignKey('account.id'),
+                           nullable=False)
+    user_id = db.Column(db.Integer, db.ForeignKey('user.id'), nullable=False)
+
+    def __init__(self, account_id, user_id):
+        self.account_id = account_id
+        self.user_id = user_id
+
+    def __repr__(self):
+        return '<Account_User {0} {1}>'.format(self.account_id, self.user_id)