如何从 themoviedb api 获取多页结果并存储在 React Native 中的 state 中？

Question

I am stuck in trying to get page 2 results in the same state... Please take a look at my code and help me.

    const URL = 'https://api.themoviedb.org/3/movie/now_playing?api_key=#&language=en-US&page=1';
    const [movies, setMovies] = useState([]);

    const testapi = async() => {
      const response = await fetch(urlGiven);
      const data = await response.json();
      setMovies(data.results);
    }

Now I am trying to another request to the api with &page=2 and set that data to append my current movies const... I tried doing setState([...movies, data.results]) again for:

https://api.themoviedb.org/3/movie/now_playing?api_key=#&language=en-US&page=2

PAGE 2 data but that did not render correctly in react native flatlist.

For example, like this:

const secondCALL = async() => {
    const response = await fetch(page2URL);
    const data = await response.json();
    setMovies([...movies, data.results]);
}

How do I go on about appending page 2 data right after page one's original that is set in here: setMovies(data.results);

My flatlist set up, for example ( only showing the relevant part)

<FlatList
            data={movies}
/>

Answer 1

You need to add... at data.results, otherwise you will have [movie1, movie2, [movie3, movi4]]

const secondCALL = async() => {
   const response = await fetch(page2URL);
   const data = await response.json();
   setMovies([...movies, ...data.results]);
}

Answer 2

You need to use the spread operator synthax to expands the content of data.results.

consider this example:

const [movies, setMovies] = useState([]);
const [page, setPage] = useState(1);


const getMovies = async () => {
  try{
    let req = await fetch(`'https://api.themoviedb.org/3/movie/now_playing?api_key=#&language=en-US&page=${page}`);
    let data = await req.json();
    // spread the content of movies and data 
    setMovies([...movies, ...data]);
  }catch(err){
   throw err
  }
}

return (...)