55 lines
2.2 KiB
Markdown
55 lines
2.2 KiB
Markdown
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---
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id: 587d7fb8367417b2b2512c0e
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title: 'Perform Classic Updates by Running Find, Edit, then Save'
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challengeType: 2
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forumTopicId: 301541
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dashedName: perform-classic-updates-by-running-find-edit-then-save
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---
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# --description--
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In the good old days, this was what you needed to do if you wanted to edit a document, and be able to use it somehow (e.g. sending it back in a server response). Mongoose has a dedicated updating method: `Model.update()`. It is bound to the low-level mongo driver. It can bulk-edit many documents matching certain criteria, but it doesn’t send back the updated document, only a 'status' message. Furthermore, it makes model validations difficult, because it just directly calls the mongo driver.
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# --instructions--
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Modify the `findEditThenSave` function to find a person by `_id` (use any of the above methods) with the parameter `personId` as search key. Add `"hamburger"` to the list of the person's `favoriteFoods` (you can use `Array.push()`). Then - inside the find callback - `save()` the updated `Person`.
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**Note:** This may be tricky, if in your Schema, you declared `favoriteFoods` as an Array, without specifying the type (i.e. `[String]`). In that case, `favoriteFoods` defaults to Mixed type, and you have to manually mark it as edited using `document.markModified('edited-field')`. See [Mongoose documentation](https://mongoosejs.com/docs/schematypes.html#Mixed)
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# --hints--
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Find-edit-update an item should succeed
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```js
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(getUserInput) =>
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$.post(getUserInput('url') + '/_api/find-edit-save', {
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name: 'Poldo',
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age: 40,
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favoriteFoods: ['spaghetti']
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}).then(
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(data) => {
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assert.equal(data.name, 'Poldo', 'item.name is not what is expected');
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assert.equal(data.age, 40, 'item.age is not what expected');
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assert.deepEqual(
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data.favoriteFoods,
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['spaghetti', 'hamburger'],
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'item.favoriteFoods is not what expected'
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);
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assert.equal(data.__v, 1, 'The item should be previously edited');
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},
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(xhr) => {
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throw new Error(xhr.responseText);
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}
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);
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```
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# --solutions--
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```js
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/**
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Backend challenges don't need solutions,
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because they would need to be tested against a full working project.
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Please check our contributing guidelines to learn more.
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*/
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```
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