id,node_id,number,title,user,state,locked,assignee,milestone,comments,created_at,updated_at,closed_at,author_association,pull_request,body,repo,type,active_lock_reason,performed_via_github_app,reactions,draft,state_reason
1227571375,I_kwDOCGYnMM5JK0Cv,431,Allow making m2m relation of a table to itself,738408,open,0,,,3,2022-05-06T08:30:43Z,2022-06-23T14:12:51Z,,NONE,,"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.

Example: 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:

```python
from sqlite_utils import Database

db = Database(memory=True)
db[""people""].insert({""name"": ""John""}, pk=""name"").m2m(
    ""people"", [{""name"": ""Michael""}, {""name"": ""Suzy""}], m2m_table=""parent_child"", pk=""name""
)
db[""people""].insert({""name"": ""Mary""}, pk=""name"").m2m(
    ""people"", [{""name"": ""Michael""}, {""name"": ""Suzy""}], m2m_table=""parent_child"", pk=""name""
)
```

But if I do that, the many-to-many table `parent_child` has only one column:
```
CREATE TABLE [parent_child] (
   [people_id] TEXT REFERENCES [people]([name]),
   PRIMARY KEY ([people_id], [people_id])
)
```

This 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))`.",140912432,issue,,,"{""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}",,