first

Author: zainasher42

app.py

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+from flask import Flask
+from flask_sqlalchemy import SQLAlchemy
+from flask_migrate import Migrate
+import config
+
+app = Flask(__name__)
+app.config.from_object(config.SQLiteConfig)  # Choose SQLiteConfig, MySQLConfig, or PostgreSQLConfig
+
+db = SQLAlchemy(app)
+migrate = Migrate(app, db)
+
+# Register models
+import models
+
+# Route for testing
+@app.route('/')
+def index():
+    return "Flask-Migrate setup is working!"
+
+if __name__ == '__main__':
+    app.run(debug=True)

config.py

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+import os
+
+class Config:
+    SQLALCHEMY_TRACK_MODIFICATIONS = False
+
+class SQLiteConfig(Config):
+    SQLALCHEMY_DATABASE_URI = 'sqlite:///site.db'
+
+class MySQLConfig(Config):
+    SQLALCHEMY_DATABASE_URI = 'mysql+pymysql://username:password@localhost/dbname'
+
+class PostgreSQLConfig(Config):
+    SQLALCHEMY_DATABASE_URI = 'postgresql://username:password@localhost/dbname'

models.py

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+from app import db
+
+class User(db.Model):
+    id = db.Column(db.Integer, primary_key=True)
+    username = db.Column(db.String(80), unique=True, nullable=False)
+    email = db.Column(db.String(120), unique=True, nullable=False)
+
+    def __repr__(self):
+        return f'<User {self.username}>'

requirements.txt

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+Flask==2.3.2
+SQLAlchemy==2.0.23
+Flask-Migrate==4.0.4
+pymysql==1.0.3         # For MySQL support
+psycopg2-binary==2.9.7 # For PostgreSQL support