René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Add [unique] for non-PK foreign key","articleBody":"A very simple example case:\r\n\r\n```\r\n@schema\r\nclass TableA(dj.Manual):\r\n    definition = \"\"\"\r\n    a_attr: int\r\n    \"\"\"\r\n```\r\n\r\n```\r\n@schema\r\nclass TableB(dj.Manual):\r\n    definition = \"\"\"\r\n    b1_attr: int\r\n    b2_attr: int\r\n    ---\r\n    b3_attr: int\r\n    \"\"\"\r\n```\r\n\r\nand \r\n\r\n```\r\n@schema\r\nclass TableC(dj.Manual):\r\n    definition = \"\"\"\r\n    -\u003e TableA\r\n    ---\r\n    -\u003e [unique] TableB\r\n    \"\"\"\r\n```\r\n\r\nbut currently, such definition for 'TableC' is not supported, instead, I need to do something like:\r\n```\r\n@schema\r\nclass TableC(dj.Manual):\r\n    definition = \"\"\"\r\n    -\u003e TableA\r\n    ---\r\n    -\u003e TableB\r\n    unique index (b1_attr, b2_attr)\r\n    \"\"\"\r\n```\r\n","author":{"url":"https://github.com/ttngu207","@type":"Person","name":"ttngu207"},"datePublished":"2019-09-10T19:33:31.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":5},"url":"https://github.com/656/datajoint-python/issues/656"}