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111 lines
2.6 KiB
Markdown
111 lines
2.6 KiB
Markdown
# Update Data Connections
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At this point we have a `team` table:
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<table>
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<tr>
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<th>id</th><th>name</th><th>headquarters</th>
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</tr>
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<tr>
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<td>1</td><td>Preventers</td><td>Sharp Tower</td>
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</tr>
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<tr>
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<td>2</td><td>Z-Force</td><td>Sister Margaret’s Bar</td>
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</tr>
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</table>
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And a `hero` table:
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<table>
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<tr>
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<th>id</th><th>name</th><th>secret_name</th><th>age</th><th>team_id</th>
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</tr>
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<tr>
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<td>1</td><td>Deadpond</td><td>Dive Wilson</td><td>null</td><td>2</td>
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</tr>
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<tr>
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<td>2</td><td>Rusty-Man</td><td>Tommy Sharp</td><td>48</td><td>1</td>
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</tr>
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<tr>
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<td>3</td><td>Spider-Boy</td><td>Pedro Parqueador</td><td>null</td><td>null</td>
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</tr>
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</table>
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Some of these heroes are part of a team.
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Now we'll see how to **update** those connections between rows tables.
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We will continue with the code we used to create some heroes, and we'll update them.
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<details>
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<summary>👀 Full file preview</summary>
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```Python
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{!./docs_src/tutorial/connect/insert/tutorial001.py!}
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```
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</details>
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## Assign a Team to a Hero
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Let's say that **Tommy Sharp** uses his "rich uncle" charms to recruit **Spider-Boy** to join the team of the **Preventers**, now we need to update our Spider-Boy hero object to connect it to the Preventers team.
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Doing it is just like updating any other field:
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```Python hl_lines="8"
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# Code above omitted 👆
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{!./docs_src/tutorial/connect/update/tutorial001.py[ln:31-32]!}
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# Previous code here omitted 👈
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{!./docs_src/tutorial/connect/update/tutorial001.py[ln:62-66]!}
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# Code below omitted 👇
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```
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<details>
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<summary>👀 Full file preview</summary>
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```Python
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{!./docs_src/tutorial/connect/update/tutorial001.py!}
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```
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</details>
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We can simply **assign** a value to that field attribute `team_id`, then `add()` the hero to the session, and then `commit()`.
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Next we `refresh()` it to get the recent data, and we print it.
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Running that in the command line will output:
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<div class="termy">
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```console
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$ python app.py
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// Previous output omitted 😉
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// Update the hero
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INFO Engine UPDATE hero SET team_id=? WHERE hero.id = ?
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INFO Engine [generated in 0.00014s] (1, 3)
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// Commit the session saving the changes
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INFO Engine COMMIT
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// Automatically start a new transaction
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INFO Engine BEGIN (implicit)
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// Refresh the hero data
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INFO Engine SELECT hero.id, hero.name, hero.secret_name, hero.age, hero.team_id
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FROM hero
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WHERE hero.id = ?
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INFO Engine [cached since 0.08837s ago] (3,)
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// Print the updated hero
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Updated hero: id=3 secret_name='Pedro Parqueador' team_id=1 name='Spider-Boy' age=None
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```
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</div>
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And now **Spider-Boy** has the `team_id=1`, which is the ID of the Preventers. 🎉
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Let's now see how to remove connections in the next chapter. 💥
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