fetch not returning data in react

Question

I'm new to react, i'm having difficulty getting data for a single book out of list, be passed through via axios' get method. I think it has something to do with the url, but I have been unable to get fix it.

Here's my code:

export function loadBook(book){
    return dispatch  => {
        return axios.get('http://localhost:3000/api/books/book/:id').then(book => {
            dispatch(loadBookSuccess(book.data));
            console.log('through!');
        }).catch(error => {
            console.log('error');
        });
    };
}

//also tried this
export function loadBook(id){
    return dispatch  => {
        return axios.get('http://localhost:3000/api/books/book/' + {id}).then(book => {
            dispatch(loadBookSuccess(book.data));
            console.log('through!');
        }).catch(error => {
            console.log('error');
        });
    };
}

Html code that contains a variable link to each individual book

 <div className="container">
                <h3><Link to={'/book/' + book._id}> {book.title}</Link></h3>
                <h5>Author: {book.author.first_name + ' ' + book.author.family_name}</h5>
                <h4>Summary: {book.summary}</h4>
                <BookGenre genre={genre} />
                              
            </div>
            
            

link in Route:

<Route path="/book/:id" component={BookPage} />

Edit: code for the book component

class BookPage extends React.Component{
    render(){
        const book = this.props;
        const genre = book.genre;
        console.log(book);

        return(
            <div>
            <div>
                <h3> {book.title}</h3>
                <h5>Author: {book.author.first_name + ' ' + book.author.family_name}</h5>
                <h4>Summary: {book.summary}</h4>
                <BookGenre genre={genre} />                
            </div>
        
        </div>
        );
    }
}

BookPage.propTypes = {
    book: PropTypes.object.isRequired
};

//setting the book with mapStateToProps
function mapStateToProps (state, ownProps){
    let book = {title: '', author: '', summary: '', isbn: '', genre: []};
    const bookid = ownProps.params._id;
    if(state.books.length > 0){
        book = Object.assign({}, state.books.find(book => book.id));
    }
    return {
        book: book
    };
}

function mapDispatchToProps (dispatch) {
    return {
        actions: bindActionCreators(loadBook, dispatch)
    };
}



export default connect(mapStateToProps, mapDispatchToProps)(BookPage);

Answer 1

Figured out the solution to this problem. My mistake was that I failed to send the id of the item I along with the api call. Using componentDidMount and sending the dynamic id from the url params solved this problem for me.

Thank you, @Vinit Raj, I guess I was too much of a rookie then.

Answer 2

Instead of doing this:-

axios.get('http://localhost:3000/api/books/book/' + {id})

You should do like this:-

axios.get(`http://localhost:3000/api/books/book/${id}`)

So your action.js might look like this:-

export function loadBook(id){
    const request = axios.get(`http://localhost:3000/api/books/book/${id}`);
    return dispatch  => {
        request.then(book => {
            dispatch(loadBookSuccess(book.data));
        }).catch(error => {
            console.log('error');
        })
    };
}

Since the id, you have passed it seems to be a string so it can be concatenated using ES6 template strings and make sure you wrap your strings in backtick . or you can do it by + operator, also make sure you pass id as a parameter in your loadbook function so that you can join it to your URL.