How to use filter to search in multiple key values of objects in an array?

Question

I have an array of wines containing objects with data for each wine:

var wines = [
  { _id: '59a740b8aa06e549918b1fda',
    wineryName: 'Some Winery',
    wineName: 'Pinot Noir',
    wineColor: 'Red',
    imageLink: '/img/FortBerensPN.png' },
  { _id: '59a7410aaa06e549918b1fdb',
    wineryName: 'Some Winery',
    wineName: 'Pinot Gris',
    wineColor: 'White',
    imageLink: '/img/FortBerensPG.png' },
  { _id: '59a74125aa06e549918b1fdc',
    wineryName: 'Some Winery',
    wineName: 'Rose',
    wineColor: 'Rose',
    imageLink: '/img/FortBerensRose.png' },
  { _id: '59a74159aa06e549918b1fdd',
    wineryName: 'Some other Winery',
    wineName: 'Rose',
    wineColor: 'Rose',
    imageLink: '/img/FortBerensRose.png' },
  { _id: '59a7417aaa06e549918b1fde',
    wineryName: 'Some other Winery',
    wineName: 'Pinot Gris',
    wineColor: 'White',
    imageLink: '/img/FortBerensPG.png' },
  { _id: '59a8721f4fd43b676a1f5f0d',
    wineryName: 'Some other Winery',
    wineName: 'Pinot Gris',
    wineColor: 'White',
    imageLink: '/img/FortBerensPG.png' },
  { _id: '59a872244fd43b676a1f5f0e',
    wineryName: 'Winery 3',
    wineName: 'Pinot Noir',
    wineColor: 'Red',
    imageLink: '/img/FortBerensPN.png' } ]

I can figure out how to search -- case insensitive -- for a wine object, while specifying which key of the object to search in, like this:

var search = 'Noir'

filteredWines = function () {
  return wines.filter(function(wine){
    return (wine.wineName.toLowerCase().indexOf(search.toLowerCase())>=0;
  });
};

Returns:

[ { _id: '59a740b8aa06e549918b1fda',
    wineryName: 'Some Winery',
    wineName: 'Pinot Noir',
    wineColor: 'Red',
    imageLink: '/img/FortBerensPN.png' },
  { _id: '59a872244fd43b676a1f5f0e',
    wineryName: 'Winery 3',
    wineName: 'Pinot Noir',
    wineColor: 'Red',
    imageLink: '/img/FortBerensPN.png' } ]

However, if var search = 'Winery 3' or var search = 'red' then it will obviously return no results, as it's looking in the value of wineName of each object in the array.

So is there a way to use filter (or another method?) to search through all key values, or even better, multiple specified key values and return an array of the matching objects?

Something like:

filteredWines = function () {
  return wines.filter(function(wine){
    return ((wine.wineName.toLowerCase() && wine.wineName.toLowerCase() 
          && wine.wineName.toLowerCase()).indexOf(search.toLowerCase())>=0;
  });
};

Or am I completely barking up the wrong tree?

PS. I'm using Vue.js 2 so if there's a better way inside vue then I'm all ears!

Answer 1

You could have a more generic function that will scan all the properties for the string. Loop through all property values with Object.values() and use some to bail out as soon as you have a match:

filteredWines = function (search) {
    var lowSearch = search.toLowerCase();
    return wines.filter(function(wine){
        return Object.values(wine).some( val => 
            String(val).toLowerCase().includes(lowSearch) 
        );
    });
}

If you prefer to pass specific keys to search in:

filteredWines = function (search, keys) {
    var lowSearch = search.toLowerCase();
    return wines.filter(function(wine){
        return keys.some( key => 
            String(wine[key]).toLowerCase().includes(lowSearch) 
        );
    });
}

Call as

filteredWines('Winery 3', ['wineryName', 'wineName']);

Answer 2

Can also be done this way:

    this.wines = this.wines.filter((item) => {
                return (item.wineryName.toString().toLowerCase().indexOf(val.toLowerCase()) > -1 ||
                item.wineName.toLowerCase().indexOf(val.toLowerCase()) > -1 ||
                item.wineColor.toLowerCase().indexOf(val.toLowerCase()) > -1);
            })

Answer 3

Filter works. Oops, I read the question a bit more closely. Filter still works but you have to filter the values, too.

 let wines = [ { _id: '59a740b8aa06e549918b1fda', wineryName: 'Some Winery', wineName: 'Pinot Noir', wineColor: 'Red', imageLink: '/img/FortBerensPN.png' }, { _id: '59a7410aaa06e549918b1fdb', wineryName: 'Some Winery', wineName: 'Pinot Gris', wineColor: 'White', imageLink: '/img/FortBerensPG.png' }, { _id: '59a74125aa06e549918b1fdc', wineryName: 'Some Winery', wineName: 'Rose', wineColor: 'Rose', imageLink: '/img/FortBerensRose.png' }, { _id: '59a74159aa06e549918b1fdd', wineryName: 'Some other Winery', wineName: 'Rose', wineColor: 'Rose', imageLink: '/img/FortBerensRose.png' }, { _id: '59a7417aaa06e549918b1fde', wineryName: 'Some other Winery', wineName: 'Pinot Gris', wineColor: 'White', imageLink: '/img/FortBerensPG.png' }, { _id: '59a8721f4fd43b676a1f5f0d', wineryName: 'Some other Winery', wineName: 'Pinot Gris', wineColor: 'White', imageLink: '/img/FortBerensPG.png' }, { _id: '59a872244fd43b676a1f5f0e', wineryName: 'Winery 3', wineName: 'Pinot Noir', wineColor: 'Red', imageLink: '/img/FortBerensPN.png' } ]; let search = (val) => wines.filter(w => Object.values(w).filter(v => v.toLowerCase().indexOf(val.toLowerCase()) !== -1).length > 0); console.log(search('some')); 

Answer 4

I also would recommend trying a more general approach:

function getMatchingWhine(keys, searchTerm, wines) {

  function extractTextFromKeys(keys, object) {
    let text = '';
    keys.forEach(key => {
        text += ' ' + object[key];
    });
    return text.toLowerCase();
  }

  return wines.filter(wine => {
    const relevantText = extractTextFromKeys(keys, wine);
    return relevantText.includes(searchTerm.toLowerCase());
  });
}

Answer 5

Used the solution from "trincot" and changed it for my angular5 application to this:

filter(search, list): Observable<IFilteredList> {
  return list.filter(item => {
    return Object.values(item).some(val =>
      String(val).includes(search)
    );
  })
}