Merge branch 'fullstack-hy2020:source' into ptbr-translation

Author: mayconblopes

.github/workflows/continuous-integration-workflow.yml

@@ -28,8 +28,8 @@ jobs:
           cd public 
           pwd
           ls -la
-      - name: wtf
+      - name: Gatsby Publish
         uses: enriikke/gatsby-gh-pages-action@v2
         with:
           access-token: ${{ secrets.SEKRED2 }}
- 
+ 

src/content/0/en/part0a.md

@@ -174,7 +174,7 @@ By submitting all exercises for part 13 of the course on Relational databases, y
 
 How to study the course – instructions in a nutshell: 5 cr core course CSM141081
 
-- Do the exercises. The exercises are submitted through GitHub and marking them as done on the [submission system](https://studies.cs.helsinki.fi/stats/courses/fullstackopen).
+- Do the exercises. The exercises are submitted through GitHub and marking them is done on the [submission system](https://studies.cs.helsinki.fi/stats/courses/fullstackopen).
     - [The course certificate](/en/part0/general_info#course-certificate) will be available in the submission system
 - If you want to get University of Helsinki credits
     - Enroll in the course. You will get the enrollment link through the submission system once you have completed enough exercises. Read more [here](/en/part0/general_info#submitting-exercises)
@@ -186,7 +186,7 @@ Please note that if you do the "base course" with 6 or 7 credits, you need separ
 
 How to study the course – instructions in a nutshell: other course parts
 
-- Do the exercises. The exercises are submitted through GitHub and marking them as done on the submission system. Note that parts 8-13 have a separate instance in the submission system
+- Do the exercises. The exercises are submitted through GitHub and marking them is done on the submission system. Note that parts 8-13 have a separate instance in the submission system
     - [The course certificate](/en/part0/general_info#course-certificate) will be available in the submission system
 - If you want to get University of Helsinki credits
     - Enroll in the course. You can enroll in each part through the link in the course material ([Parts and completion](/en/part0/general_info#parts-and-completion)). Enroll in each part separately.

src/content/1/fi/osa1d.md

@@ -318,7 +318,7 @@ Konsoli paljastaa ongelman
 
 ![](../../images/1/32.png)
 
-Vaikka tilalle _left_ asetettiin uusi arvo kutsumalla _setLeft(left + 1)_ on tilalla siis tapahtumankäsittelijän sisällä edelleen vanha arvo päivityksestä huolimatta! Tämän takia seuraava takia nappien painallusten laskuyritys tuottaa aina yhtä liian pienen tuloksen:
+Vaikka tilalle _left_ asetettiin uusi arvo kutsumalla _setLeft(left + 1)_ on tilalla siis tapahtumankäsittelijän sisällä edelleen vanha arvo päivityksestä huolimatta! Tämän takia seuraava nappien painallusten laskuyritys tuottaa aina yhtä liian pienen tuloksen:
 
 ```js
 setTotal(left + right) 

src/content/13/en/part13a.md

@@ -156,7 +156,7 @@ postgres=#
 ```
 
 Defined in this way, the data stored in the database is persisted only as long as the container exists. The data can be preserved by defining a
-[volume](/en/part12/building_and_configuring_environments#persisting-data-with-volumes) fort the data, see more
+[volume](/en/part12/building_and_configuring_environments#persisting-data-with-volumes) for the data, see more
 [here](https://github.com/docker-library/docs/blob/master/postgres/README.md#pgdata).
 
 #### Using the psql console
@@ -781,7 +781,7 @@ Now the result is exactly what we want:
 In the case of a collection of objects, the method toJSON does not work directly, the method must be called separately for each object in the collection:
 
 ```js
-router.get('/', async (req, res) => {
+app.get('/api/notes', async (req, res) => {
   const notes = await Note.findAll()
 
   console.log(notes.map(n=>n.toJSON())) // highlight-line
@@ -806,7 +806,7 @@ The print looks like the following:
 However, perhaps a better solution is to turn the collection into JSON for printing by using the method [JSON.stringify](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/JSON/stringify):
 
 ```js
-router.get('/', async (req, res) => {
+app.get('/api/notes', async (req, res) => {
   const notes = await Note.findAll()
 
   console.log(JSON.stringify(notes)) // highlight-line

src/content/13/en/part13c.md

@@ -219,11 +219,11 @@ module.exports = {
   up: async ({ context: queryInterface }) => {
     await queryInterface.addColumn('users', 'admin', {
       type: DataTypes.BOOLEAN,
-      default: false
+      defaultValue: false
     })
     await queryInterface.addColumn('users', 'disabled', {
       type: DataTypes.BOOLEAN,
-      default: false
+      defaultValue: false
     })
   },
   down: async ({ context: queryInterface }) => {

src/content/2/en/part2c.md

@@ -362,7 +362,7 @@ What's not immediately obvious, however, is where the command <em>axios.get</em>
 
 ### Effect-hooks
 
-We have already used [state hooks](https://react.dev/learn/state-a-components-memory) that were introduced along with React version [16.8.0](https://www.npmjs.com/package/react/v/16.8.0), which provide state to React components defined as functions - the so-called <i>functional components</i>. Version 16.8.0 also introduces [effect hooks](https://reactjs.org/docs/hooks-effect.html) as a new feature. As per the official docs:
+We have already used [state hooks](https://react.dev/learn/state-a-components-memory) that were introduced along with React version [16.8.0](https://www.npmjs.com/package/react/v/16.8.0), which provide state to React components defined as functions - the so-called <i>functional components</i>. Version 16.8.0 also introduces [effect hooks](https://react.dev/reference/react#effect-hooks) as a new feature. As per the official docs:
 
 > <i>The Effect Hook lets you perform side effects on function components.</i>
 > <i>Data fetching, setting up a subscription, and manually changing the DOM in React components are all examples of side effects.</i>

src/content/2/en/part2d.md

@@ -233,7 +233,7 @@ axios.put(url, note).then(response => {
   // ...
 ```
 
-This is not recommended because the variable <em>note</em> is a reference to an item in the <em>notes</em> array in the component's state, and as we recall we must [never mutate state directly](https://reactjs.org/docs/state-and-lifecycle.html#using-state-correctly) in React.
+This is not recommended because the variable <em>note</em> is a reference to an item in the <em>notes</em> array in the component's state, and as we recall we must [never mutate state directly](https://react.dev/learn/updating-objects-in-state#why-is-mutating-state-not-recommended-in-react) in React.
 
 It's also worth noting that the new object _changedNote_ is only a so-called [shallow copy](https://en.wikipedia.org/wiki/Object_copying#Shallow_copy), meaning that the values of the new object are the same as the values of the old object. If the values of the old object were objects themselves, then the copied values in the new object would reference the same objects that were in the old object.
 

src/content/3/en/part3a.md

@@ -883,6 +883,10 @@ Implement a page at the address <http://localhost:3001/info> that looks roughly
 ![Screenshot for 3.2](../../images/3/23x.png)
 
 The page has to show the time that the request was received and how many entries are in the phonebook at the time of processing the request.
+  
+Proposed Addition: There can only be one response.send() statement in an Express app route. Once you send a response to the client using response.send(), the request-response cycle is complete and no further response can be sent. 
+  
+To include a line space in the output, use <br/> tag, or wrap the statements in <p> tags.
 
 #### 3.3: Phonebook backend step3
 

src/content/3/en/part3c.md

@@ -400,7 +400,7 @@ One way to format the objects returned by Mongoose is to [modify](https://stacko
 
 To modify the method we need to change the configurable options of the schema, options can be changed using the set method of the schema, see here for more info on this method: https://mongoosejs.com/docs/guide.html#options. See <https://mongoosejs.com/docs/guide.html#toJSON> and <https://mongoosejs.com/docs/api.html#document_Document-toObject> for more info on the _toJSON_ option.
 
-see <https://mongoosejs.com/docs/api.html#transform> for more info on the _transform_ function.
+see <https://mongoosejs.com/docs/api/document.html#transform> for more info on the _transform_ function.
 
 ```js
 noteSchema.set('toJSON', {

src/content/3/en/part3d.md

@@ -85,7 +85,7 @@ When validating an object fails, we return the following default error message f
 ![postman showing error message](../../images/3/50.png)
 
 We notice that the backend has now a problem: validations are not done when editing a note.
-The [documentation](https://github.com/blakehaswell/mongoose-unique-validator#find--updates) explains what is the problem, validations are not run by default when <i>findOneAndUpdate</i> is executed.
+The [documentation](https://github.com/blakehaswell/mongoose-unique-validator#find--updates) addresses the issue by explaining that validations are not run by default when <i>findOneAndUpdate</i> is executed.
 
 The fix is easy. Let us also reformulate the route code a bit: