Trivia APP

Installing Dependencies for the Backend

1. Python 3.7 - Follow instructions to install the latest version of python for your platform in the python docs

2. Virtual Enviornment - We recommend working within a virtual environment whenever using Python for projects. This keeps your dependencies for each project separate and organaized. Instructions for setting up a virual enviornment for your platform can be found in the python docs

3. PIP Dependencies - Once you have your virtual environment setup and running, install dependencies by running:

pip install -r requirements.txt

This will install all of the required packages we selected within the requirements.txt file.

4. Key Dependencies

• Flask is a lightweight backend microservices framework. Flask is required to handle requests and responses.

• SQLAlchemy is the Python SQL toolkit and ORM we'll use handle the lightweight sqlite database. You'll primarily work in app.py and can reference models.py.

• Flask-CORS is the extension we'll use to handle cross origin requests from our frontend server.

Database Setup

With Postgres running, restore a database using the trivia.psql file provided. From the backend folder in terminal run:

psql trivia < trivia.psql

Running the server

Each time you open a new terminal session, run:

export FLASK_APP=app
export FLASK_ENV=development

To run the server, execute:

flask run --reload

The --reload flag will detect file changes and restart the server automatically.

Testing

To run the tests, run

dropdb trivia_test
createdb trivia_test
psql trivia_test < trivia.psql
python test_app.py

Enviroment

To set up environmemnt variables, create a file named .env. Here is the template

DB_NAME=<DB_NAME>
DB_USER=<DB_USER>
DB_PASSWORD=<DB_PASSWORD>
DB_HOST=<DB_HOST>

Roles and Permissions

Admin Role

post:question
patch:question
delete:question
play:quiz

User Role

play:quiz

To generate auth token

https://abdullah-udacity-fsnd.us.auth0.com/authorize?audience=trivia&response_type=token&client_id=s8xOh49uaAjQLZViNHp2xd4uckVlcSXT&redirect_uri=http://127.0.0.1:5000

Deployment link

https://trivia-fsnd.herokuapp.com/

Endpoints

GET '/categories'
- Fetches a dictionary of categories in which the keys are the ids and the value is the corresponding string of the category
- Request Arguments: None
- Returns: An object with a single key, categories, that contains an object of id: category_string key:value pairs. 
{
    'categories': { '1' : "Science",
    '2' : "Art",
    '3' : "Geography",
    '4' : "History",
    '5' : "Entertainment",
    '6' : "Sports" }
}

GET '/questions?page=${integer}'
- Fetches a paginated set of questions, a total number of questions, all categories and current category string. 
- Request Arguments: page - integer
- Returns: An object with 10 paginated questions, total questions, object including all categories, and current category string
{
    'questions': [
        {
            'id': 1,
            'question': 'This is a question',
            'answer': 'This is an answer', 
            'difficulty': 5,
            'category': 2
        },
    ],
    'totalQuestions': 100,
    'categories': { '1' : "Science",
    '2' : "Art",
    '3' : "Geography",
    '4' : "History",
    '5' : "Entertainment",
    '6' : "Sports" },
    'currentCategory': 'History'
}

GET '/categories/${id}/questions'
- Fetches questions for a cateogry specified by id request argument 
- Request Arguments: id - integer
- Returns: An object with questions for the specified category, total questions, and current category string 
{
    'questions': [
        {
            'id': 1,
            'question': 'This is a question',
            'answer': 'This is an answer', 
            'difficulty': 5,
            'category': 4
        },
    ],
    'totalQuestions': 100,
    'currentCategory': 'History'
}

DELETE '/questions/${id}'
- Deletes a specified question using the id of the question
- Request Arguments: id - integer
- Returns: Does not need to return anything besides the appropriate HTTP status code. Optionally can return the id of the question. If you are able to modify the frontend, you can have it remove the question using the id instead of refetching the questions. 

POST '/quizzes'
- Sends a post request in order to get the next question 
- Request Body: 
{'previous_questions':  an array of question id's such as [1, 4, 20, 15]
'quiz_category': a string of the current category }
- Returns: a single new question object 
{
    'question': {
        'id': 1,
        'question': 'This is a question',
        'answer': 'This is an answer', 
        'difficulty': 5,
        'category': 4
    }
}

POST '/questions'
- Sends a post request in order to add a new question
- Request Body: 
{
    'question':  'Heres a new question string',
    'answer':  'Heres a new answer string',
    'difficulty': 1,
    'category': 3,
}
- Returns: Does not return any new data

POST '/questions'
- Sends a post request in order to search for a specific question by search term 
- Request Body: 
{
    'searchTerm': 'this is the term the user is looking for'
}
- Returns: any array of questions, a number of totalQuestions that met the search term and the current category string 
{
    'questions': [
        {
            'id': 1,
            'question': 'This is a question',
            'answer': 'This is an answer', 
            'difficulty': 5,
            'category': 5
        },
    ],
    'totalQuestions': 100,
    'currentCategory': 'Entertainment'
}

PATCH '/questions/${id}'
- Sends a patch request to update a specific question with given values
- Request Body: 
{
    'difficulty': 3,
    'category': 1,
}
- Returns: any object of question
{
    'questions': [
        {
            'id': 1,
            'question': 'This is a question',
            'answer': 'This is an answer', 
            'difficulty': 5,
            'category': 5
        },
    ],
    'totalQuestions': 100,
    'currentCategory': 'Entertainment'
}