Illuminate\Database\QueryException with message ‘SQLSTATE[23000]: Integrity constraint violation: 1452 Cannot add or update a child row: a foreign key constraint fails (blog.comments, CONSTRAINT comments_discussion_id_foreign FOREIGN KEY (discussion_id) REFERENCES discussions (id) ON DELETE CASCADE) (SQL: insert into comments (body, user_id, discussion_id, updated_at, created_at) values (Ratione adipisci numquam eos accusamus velit. Quod quod nulla velit voluptatem fuga. Ut sit veritatis aliquam quod rem autem occaecati., 138, 150, 2018-05-14 04:03:21, 2018-05-14 04:03:21))’