#7 Basic flask app. Setup routes, DB, and made a user model. Made initial migrations

backend/app/__init__.py

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+from flask import Flask
+from flask_sqlalchemy import SQLAlchemy
+from flask_migrate import Migrate
+from flask_login import LoginManager
+from config import Config
+
+
+db = SQLAlchemy()
+migrate = Migrate()
+login = LoginManager()
+login.login_view = "login"
+login.login_message = "Please log in to access this page."
+
+
+def create_app(config_class=Config):
+    app = Flask(__name__)
+    app.config.from_object(config_class)
+
+    db.init_app(app)
+    migrate.init_app(app, db)
+    login.init_app(app)
+
+    app.app_context().push()
+
+    from app.bp import bp as main_bp
+
+    app.register_blueprint(main_bp)
+
+    app.app_context()
+    return app
+
+
+from app import models

backend/app/bp.py

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+from flask import Blueprint
+
+bp = Blueprint('index', __name__)
+
+from app import routes

backend/app/errors.py

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+from flask import jsonify
+from werkzeug.http import HTTP_STATUS_CODES
+
+
+def error_response(status_code, message=None):
+    payload = {"error": HTTP_STATUS_CODES.get(status_code, "Unknown error")}
+    if message:
+        payload["message"] = message
+    response = jsonify(payload)
+    response.status_code = status_code
+    return response
+
+
+def bad_request(message):
+    return error_response(400, message)

backend/app/models.py

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+from app import db
+from flask_login import UserMixin
+from datetime import datetime
+
+
+class User(UserMixin, db.Model):
+    id = db.Column(db.Integer, primary_key=True)
+    username = db.Column(db.String(64), index=True, unique=True)
+    email = db.Column(db.String(120), index=True, unique=True)
+    password_hash = db.Column(db.String(128))
+    about_me = db.Column(db.String(140))
+    last_seen = db.Column(db.DateTime, default=datetime.utcnow)
+    token = db.Column(db.String(32), index=True, unique=True)
+
+    def to_dict(self):
+        return {
+            "id": self.id,
+            "username": self.username,
+            "email": self.email,
+            "about_me": self.about_me,
+        }

backend/app/routes.py

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+from app.bp import bp
+from flask import Response, jsonify, request
+from app.errors import error_response
+
+from app import db
+from app.models import User
+
+
+@bp.route("/login", methods=["POST"])
+def login():
+    data = request.get_json()
+    print(data)
+    if not data.get("user_id"):
+        return error_response(400, "Must supply user_id")
+
+    user = User.query.get(data.get("user_id"))
+    if not user:
+        return error_response(400, "User not found")
+
+    resp = jsonify(user.to_dict())
+    resp.status_code = 200
+    return resp