From eded64e6e8e624879cc5e1bbe2aaaac369874f32 Mon Sep 17 00:00:00 2001
From: Nikolai <nvanbaak@gmail.com>
Date: Mon, 7 Jun 2021 16:29:16 -0700
Subject: [PATCH] membership.create() checks for joinable and player limit;
 factory creates joinable lexicons by default

---
 amanuensis/backend/membership.py | 22 ++++++++++++++++++++++
 tests/conftest.py                |  4 +++-
 2 files changed, 25 insertions(+), 1 deletion(-)

diff --git a/amanuensis/backend/membership.py b/amanuensis/backend/membership.py
index 7440353..3161a89 100644
--- a/amanuensis/backend/membership.py
+++ b/amanuensis/backend/membership.py
@@ -5,6 +5,7 @@ Membership query interface
 from sqlalchemy import select, func
 
 from amanuensis.db import DbContext, Membership
+from amanuensis.db.models import Lexicon
 from amanuensis.errors import ArgumentError
 
 
@@ -36,6 +37,27 @@ def create(
     ):
         raise ArgumentError("User is already a member of lexicon")
 
+    # get reference to lexicon for next few checks
+    lex: Lexicon = db(
+        select(Lexicon)
+        .where(Lexicon.id == lexicon_id)
+    ).scalar_one_or_none()
+
+    # Verify lexicon is joinable; current no Lexicons are joinable so this is commented out
+    if not lex.joinable:
+        raise ArgumentError("Can't join: Lexicon is not joinable")
+
+    # Verify lexicon is not full
+    if lex.player_limit:
+        if (
+        db(
+            select(func.count())
+            .where(Membership.lexicon_id == lexicon_id)
+        ).scalar()
+        >= lex.player_limit
+        ):
+            raise ArgumentError("Can't join: Lexicon is full")
+
     new_membership = Membership(
         user_id=user_id,
         lexicon_id=lexicon_id,
diff --git a/tests/conftest.py b/tests/conftest.py
index a93b93c..0cd436f 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -49,7 +49,9 @@ def make_lexicon(db: DbContext):
         }
         state["nonce"] += 1
         updated_kwargs = {**default_kwargs, **kwargs}
-        return lexiq.create(db, **updated_kwargs)
+        lex = lexiq.create(db, **updated_kwargs)
+        lex.joinable = True
+        return lex
 
     return lexicon_factory