How to Implement Ordered Relevance Search Across Multiple Columns in Laravel?

Searching Multiple Keywords Against Multiple Columns with Ordered Relevance in Laravel

Implementing search functionality involving multiple keywords against multiple database columns can be challenging, especially when the results need to be ordered based on relevance. In Laravel, there are several approaches to tackle this.

Approach using Database Queries

One way to address the issue is by constructing multiple database queries to retrieve results based on specific criteria. Here's a possible implementation:

$word1 = 'word1';
$word2 = 'word2';
$word3 = 'word3';

$all = DB::table('posts')
    ->where('meta_name', 'like', "%{$word1}%")
    ->where('meta_name', 'like', "%{$word2}%")
    ->where('meta_name', 'like', "%{$word3}%")
    ->orWhere(function($query) use ($word1, $word2, $word3) {
        $query->where('meta_description', 'like', "%{$word1}%")
              ->where('meta_description', 'like', "%{$word2}%")
              ->where('meta_description', 'like', "%{$word3}%");
    });

$twoWords = DB::table('posts')
    ->where('meta_name', 'like', "%{$word1}%")
    ->where('meta_name', 'like', "%{$word2}%")
    ->orWhere(function($query) use ($word1, $word2) {
        $query->where('meta_description', 'like', "%{$word1}%")
              ->where('meta_description', 'like', "%{$word2}%");
    })
    ->whereNotIn('id', $all->pluck('id'));

$oneWord = DB::table('posts')
    ->where('meta_name', 'like', "%{$word1}%")
    ->orWhere('meta_description', 'like', "%{$word1}%")
    ->whereNotIn('id', $all->pluck('id'))
    ->whereNotIn('id', $twoWords->pluck('id'));

$posts = $all->union($twoWords)->union($oneWord)->get();

This approach filters results based on the presence of all three keywords, only the first two keywords, and then only the first keyword. Finally, it combines the results using the union operator.

Additional Considerations for Pagination

To implement load-on-scroll functionality, you can incorporate JavaScript and AJAX requests. When the user scrolls to the bottom of the page, an AJAX request can be sent to retrieve the next set of results. The skip() and take() methods in Query Builder can be used to specify the offset and limit of records to retrieve.

// Retrieve the specified number of results after the last loaded result
$start = $request->get('start');//how many results have already been shown

$records = Post::select('*')
                ->skip($start)
                ->take($this->rowperpage) // $this->rowperpage= 4 e.g.
                ->get();

Remember to handle the case where there are no more results available to scroll.

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