{"id": 1227571375, "node_id": "I_kwDOCGYnMM5JK0Cv", "number": 431, "title": "Allow making m2m relation of a table to itself", "user": {"value": 738408, "label": "rafguns"}, "state": "open", "locked": 0, "assignee": null, "milestone": null, "comments": 3, "created_at": "2022-05-06T08:30:43Z", "updated_at": "2022-06-23T14:12:51Z", "closed_at": null, "author_association": "NONE", "pull_request": null, "body": "I am building a database, in which one of the tables has a many-to-many relationship to itself. As far as I can see, this is not (yet) possible using `.m2m()` in sqlite-utils. This may be a bit of a niche use case, so feel free to close this issue if you feel it would introduce too much complexity compared to the benefits.\r\n\r\nExample: suppose I have a table of people, and I want to store the information that John and Mary have two children, Michael and Suzy. It would be neat if I could do something like this:\r\n\r\n```python\r\nfrom sqlite_utils import Database\r\n\r\ndb = Database(memory=True)\r\ndb[\"people\"].insert({\"name\": \"John\"}, pk=\"name\").m2m(\r\n    \"people\", [{\"name\": \"Michael\"}, {\"name\": \"Suzy\"}], m2m_table=\"parent_child\", pk=\"name\"\r\n)\r\ndb[\"people\"].insert({\"name\": \"Mary\"}, pk=\"name\").m2m(\r\n    \"people\", [{\"name\": \"Michael\"}, {\"name\": \"Suzy\"}], m2m_table=\"parent_child\", pk=\"name\"\r\n)\r\n```\r\n\r\nBut if I do that, the many-to-many table `parent_child` has only one column:\r\n```\r\nCREATE TABLE [parent_child] (\r\n   [people_id] TEXT REFERENCES [people]([name]),\r\n   PRIMARY KEY ([people_id], [people_id])\r\n)\r\n```\r\n\r\nThis could be solved by adding one or two keyword_arguments to `.m2m()`, e.g. `.m2m(..., left_name=None, right_name=None)` or `.m2m(..., names=(None, None))`.", "repo": {"value": 140912432, "label": "sqlite-utils"}, "type": "issue", "active_lock_reason": null, "performed_via_github_app": null, "reactions": "{\"url\": \"https://api.github.com/repos/simonw/sqlite-utils/issues/431/reactions\", \"total_count\": 0, \"+1\": 0, \"-1\": 0, \"laugh\": 0, \"hooray\": 0, \"confused\": 0, \"heart\": 0, \"rocket\": 0, \"eyes\": 0}", "draft": null, "state_reason": null}
{"id": 1123903919, "node_id": "I_kwDOCGYnMM5C_Wmv", "number": 397, "title": "Support IF NOT EXISTS for table creation", "user": {"value": 738408, "label": "rafguns"}, "state": "closed", "locked": 0, "assignee": null, "milestone": null, "comments": 3, "created_at": "2022-02-04T07:41:15Z", "updated_at": "2022-02-06T01:30:46Z", "closed_at": "2022-02-06T01:29:01Z", "author_association": "NONE", "pull_request": null, "body": "Currently, I have a bunch of code that looks like this:\r\n\r\n```python\r\nsubjects = db[\"subjects\"] if db[\"subjects\"].exists() else db[\"subjects\"].create({\r\n    ...\r\n})\r\n```\r\nIt would be neat if sqlite-utils could simplify that by supporting `CREATE TABLE IF NOT EXISTS`, so that I'd be able to write, e.g.\r\n\r\n```python\r\nsubjects = db[\"subjects\"].create({...}, if_not_exists=True)\r\n```", "repo": {"value": 140912432, "label": "sqlite-utils"}, "type": "issue", "active_lock_reason": null, "performed_via_github_app": null, "reactions": "{\"url\": \"https://api.github.com/repos/simonw/sqlite-utils/issues/397/reactions\", \"total_count\": 0, \"+1\": 0, \"-1\": 0, \"laugh\": 0, \"hooray\": 0, \"confused\": 0, \"heart\": 0, \"rocket\": 0, \"eyes\": 0}", "draft": null, "state_reason": "completed"}