Change referal key from uuid to urlsafe token via secrets module

Also, added compare_type=True to migration env
to catch changes like this in the future

Other than that the title says it all buddy boi

migrations/env.py

@@ -41,7 +41,7 @@ def run_migrations_offline():
 
     """
     url = config.get_main_option("sqlalchemy.url")
-    context.configure(url=url)
+    context.configure(url=url, compare_type=True)
 
     with context.begin_transaction():
         context.run_migrations()
@@ -73,6 +73,7 @@ def run_migrations_online():
     context.configure(connection=connection,
                       target_metadata=target_metadata,
                       process_revision_directives=process_revision_directives,
+                      compare_type=True,
                       **current_app.extensions['migrate'].configure_args)
 
     try:

migrations/versions/ea5307f715d1_.py

@@ -0,0 +1,34 @@
+"""empty message
+
+Revision ID: ea5307f715d1
+Revises: bb298ef84235
+Create Date: 2018-05-31 15:47:34.645982
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = 'ea5307f715d1'
+down_revision = 'bb298ef84235'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.alter_column('referal', 'key',
+               existing_type=sa.String(length=36),
+               type_=sa.String(length=43),
+               existing_nullable=True)
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.alter_column('referal', 'key',
+               existing_type=sa.String(length=43),
+               type_=sa.String(length=36),
+               existing_nullable=True)
+    # ### end Alembic commands ###

models.py

@@ -1,7 +1,7 @@
 from flask_sqlalchemy import SQLAlchemy
 from flask_login import UserMixin
 import bcrypt
-import uuid
+import secrets
 
 db = SQLAlchemy()
 
@@ -38,14 +38,14 @@ class User(db.Model, UserMixin):
 
 class Referal(db.Model):
     id = db.Column(db.Integer, primary_key=True)
-    key = db.Column(db.String(36), index=True)
+    key = db.Column(db.String(43), index=True)
     user_id = db.Column(db.Integer, db.ForeignKey('user.id'), nullable=False)
     message = db.Column(db.String(), nullable=True)
     kwargs = db.Column(db.PickleType, nullable=True)
 
     def __init__(self, user, message=None, **kwargs):
         self.user_id = user.id
-        self.key = str(uuid.uuid4())
+        self.key = secrets.token_urlsafe()
         self.message = message
         self.args = kwargs