Try to init CLForm choices sooner.

undercover/routes.py

@@ -18,6 +18,11 @@ writing_blueprint = Blueprint('writing', __name__,)
 
 
 class CLForm(Form):
+    def __init__(self, form: dict[str, str] = None, email_address: str = None, **kwargs):
+        super().__init__(form, **kwargs)
+        if email_address:
+            self.letterName.choices = letter_choices(email_address)
+
     letterName = SelectField(
         'Letter Name:',
         [validators.optional()],
@@ -139,6 +144,14 @@ def add_letter() -> Response:
     return redirect(f'/?letter_name={new_letter_name}')
 
 
+def letter_choices(email_address: str) -> list[(int, str)]:
+    user = db.get_user(email_address)
+    letters = db.get_user_letters(user.id)
+    if len(letters) == 0:
+        return []
+
+    return [(i + 1, letter.title) for i, letter in enumerate(letters)]
+
 
 @writing_blueprint.route('/', methods=['GET'])
 def index_get() -> Response:
@@ -147,12 +160,9 @@ def index_get() -> Response:
         return render_index()
 
     form = CLForm()
-    user = db.get_user(email_address)
-    letters = db.get_user_letters(user.id)
-    if len(letters) == 0:
+    letter_names = letter_choices(email_address)
+    if len(letter_names) == 0:
         return render_index()
-
-    letter_names = [(i + 1, letter.title) for i, letter in enumerate(letters)]
     form.letterName.choices = letter_names
 
     form.letterName.data = 1
@@ -265,11 +275,13 @@ def git_update() -> None:
 
 @writing_blueprint.route('/', methods=['POST'])
 def generate_pdf() -> Response:
-    form = CLForm(request.form)
-    if form.validate():
+    email_address = session.get('username')
+    form = CLForm(request.form, email_address=email_address)
+    if not form.validate():
+        return render_index(form=form)
+
     data = form.to_cl_data()
 
-        email_address = session.get('username')
     if email_address:
         user = db.get_user(email_address)
         letters = db.get_user_letters(user.id)
@@ -291,5 +303,3 @@ def generate_pdf() -> Response:
         resp.set_cookie(pair[0], urllib.parse.quote(pair[1]))
 
     return resp
-
-    return render_index(form=form)