The _DATA.js file represents a fake database and methods that let you access the data. The only thing you need to edit in the _DATA.js file is the value of avatarURL. Each user should have an avatar, so you’ll need to add the path to each user’s avatar.
Just simply use npm install / npm run or yarn install / yarn start.
There are two types of objects stored in our database:
- Users
- Questions
Users include:
| Attribute | Type | Description |
|---|---|---|
| id | String | The user’s unique identifier |
| name | String | The user’s first name and last name |
| avatarURL | String | The path to the image file |
| questions | Array | A list of ids of the polling questions this user created |
| answers | Object | The object's keys are the ids of each question this user answered. The value of each key is the answer the user selected. It can be either 'optionOne' or 'optionTwo' since each question has two options. |
Questions include:
| Attribute | Type | Description |
|---|---|---|
| id | String | The question’s unique identifier |
| author | String | The author’s unique identifier |
| timestamp | String | The time when the question was created |
| optionOne | Object | The first voting option |
| optionTwo | Object | The second voting option |
Voting options are attached to questions. They include:
| Attribute | Type | Description |
|---|---|---|
| votes | Array | A list that contains the id of each user who voted for that option |
| text | String | The text of the option |
Your code will talk to the database via 4 methods:
_getUsers()_getQuestions()_saveQuestion(question)_saveQuestionAnswer(object)
_getUsers()Method
Description: Get all of the existing users from the database.
Return Value: Object where the key is the user’s id and the value is the user object.
_getQuestions()Method
Description: Get all of the existing questions from the database.
Return Value: Object where the key is the question’s id and the value is the question object.
_saveQuestion(question)Method
Description: Save the polling question in the database.
Parameters: Object that includes the following properties: author, optionOneText, and optionTwoText. More details about these properties:
| Attribute | Type | Description |
|---|---|---|
| author | String | The id of the user who posted the question |
| optionOneText | String | The text of the first option |
| optionTwoText | String | The text of the second option |
Return Value: An object that has the following properties: id, author, optionOne, optionTwo, timestamp. More details about these properties:
| Attribute | Type | Description |
|---|---|---|
| id | String | The id of the question that was posted |
| author | String | The id of the user who posted the question |
| optionOne | Object | The object has a text property and a votes property, which stores an array of the ids of the users who voted for that option |
| optionTwo | Object | The object has a text property and a votes property, which stores an array of the ids of the users who voted for that option |
| timestamp | String | The time when the question was created |
_saveQuestionAnswer(object)Method
Description: Save the answer to a particular polling question in the database.
Parameters: Object that contains the following properties: authedUser, qid, and answer. More details about these properties:
| Attribute | Type | Description |
|---|---|---|
| authedUser | String | The id of the user who answered the question |
| qid | String | The id of the question that was answered |
| answer | String | The option the user selected. The value should be either "optionOne" or "optionTwo" |
This repository is the starter code for all Udacity students. Therefore, we most likely will not accept pull requests. For details, check out CONTRIBUTING.md.