Fix unability to delete corpora with custom dictionaries

app/models/corpus.py

@@ -54,7 +54,7 @@ def __init__(self, user, corpus, is_owner=False):
 class Column(db.Model):
     """Column."""
     id = db.Column(db.Integer, primary_key=True, autoincrement=True)
-    corpus_id = db.Column(db.Integer, db.ForeignKey("corpus.id"))
+    corpus_id = db.Column(db.Integer, db.ForeignKey("corpus.id", ondelete="CASCADE"))
     heading = db.Column(db.String(32))
     hidden = db.Column(db.Boolean, default=False)
 
@@ -1367,7 +1367,7 @@ class TYPES(enum.Enum):
 class CorpusCustomDictionary(db.Model):
 
     id = db.Column(db.Integer, primary_key=True, autoincrement=True)
-    corpus = db.Column(db.Integer, db.ForeignKey('corpus.id'), nullable=False)
+    corpus = db.Column(db.Integer, db.ForeignKey('corpus.id', ondelete="CASCADE"), nullable=False)
     label = db.Column(db.String(128), nullable=False)
     secondary_label = db.Column(db.String(128))
     category = db.Column(db.String(10), nullable=False)

tests/test_models/test_word_token.py

@@ -74,3 +74,23 @@ def test_update_batch_context(self):
         self.assertEqual(left_context[3], form_list[13]["form"])
         self.assertEqual(right_context[0], form_list[15]["form"])
         self.assertEqual(right_context[3], form_list[18]["form"])
+
+    def test_remove_corpus(self):
+        self.addCorpus("wauchier")
+        self.assertEqual(Corpus.query.get(1).name, "Wauchier", "The corpus exists")
+        self.db.session.delete(Corpus.query.get(1))
+        self.db.session.commit()
+        self.assertEqual(Corpus.query.get(1), None, "The corpus does not exist")
+
+    def test_remove_corpus_with_custom_dict(self):
+        self.addCorpus("wauchier")
+        corpus: Corpus = Corpus.query.get(1)
+        self.assertEqual(corpus.name, "Wauchier", "The corpus exists")
+        # Add connections
+        corpus.custom_dictionaries_update("lemma", "test")
+        self.assertEqual(corpus.get_custom_dictionary("lemma", formatted=True), "test")
+        # Delete the corpus
+        self.db.session.delete(Corpus.query.get(1))
+        self.db.session.commit()
+        self.assertEqual(Corpus.query.get(1), None, "The corpus does not exist")
+