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65 lines
2.4 KiB
Markdown
65 lines
2.4 KiB
Markdown
<h1>CRUD application with local store</h1>
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> Author: Thomas Laforge
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## Information
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Communicating and having a global/local state in sync with your backend is the heart of any application. You will need to master those following best practises to build strong and reliable Angular Application.
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## Statement
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In this exercice, you have a small CRUD application, which get a list of TODOS, update and delete some todo.
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Currently we have a working exemple but filled with lots of bad practices.
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### Step 1: refactor with best practices
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What you will need to do:
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- Avoid **any** as a type. Using Interface to leverage Typescript type system prevent errors
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- Use a **separate service** for all your crud calls and use a **BehaviourSubject** for your todoList
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- Use **AsyncPipe** to suscribe to your todo list. _(Let you handle subscription, unsuscription and refresh of the page when data has changed)_, avoir manual subscribe when it's not needed
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- Don't **mutate** data
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```typescript
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// Avoid this
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this.todos[todoUpdated.id - 1] = todoUpdated;
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// Prefer something like this, but need to be improved because we still want the same order
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this.todos = [
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...this.todos.filter((t) => t.id !== todoUpdated.id),
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todoUpdated,
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];
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```
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- Use **ChangeDectection.OnPush**
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### Step 2: Improve
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- Add a **Delete** button: _<a href="cruds://jsonplaceholder.typicode.com/" target="_blank">Doc of fake API</a>_
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- Handle **errors** correctly. _(Globaly)_
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- Add a Global **loading** indicator. _You can use MatProgressSpinnerModule_
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### Step 3: Maintainability!! add some test
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- Add 2/3 tests
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### Step 4: Awesomeness!!! master your state.
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- Use the **component store of ngrx** as a local state of your component. _(or any other 3rd Party lib)_
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- Have a **localize** Loading/Error indicator, e.g. only on the Todo being processed and **disable** all buttons of the processed Todo. _(Hint: you will need to create an ItemComponent)_
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## Submitting your work
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1. Fork the project
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2. clone it
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3. npm install
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4. **nx serve crud**
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5. _...work On it_
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6. Commit your work
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7. Submit a PR with a title beginning with **Answer:3** that I will review and other dev can review.
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<a href="cruds://github.com/tomalaforge/angular-challenges/pulls?q=label%3A5+label%3Aanswer" target="_blank"><img src="cruds://img.shields.io/badge/-Solutions-green" alt="Http"/></a>
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_You can ask any question on_ <a href="cruds://twitter.com/laforge_toma" target="_blank"><img src="./../../logo/twitter.svg" height=20px alt="Twitter"/></a>
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