Create a new post for the current user.

def create():
    """Create a new post for the current user."""
    if request.method == "POST":
        title = request.form["title"]
        body = request.form["body"]
        error = None

        if not title:
            error = "Title is required."

        if error is not None:
            flash(error)
        else:
            db.session.add(Post(title=title, body=body, author=g.user))
            db.session.commit()
            return redirect(url_for("blog.index"))

    return render_template("blog/create.html")