Question 290820 in Laravel Question posted in
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Laravel many to many whereDoesntHave

I have this code here simplified.

Post::whereDoesntHave('tags', function($query){
     $query->whereIn(tags.id, $tagIds);
})

Lets say that tagIds = [1,2,3]
My goal is to retrieve only Posts that do not contain all of those tags.
ex. if post has tags 1,2,3 , then it shouldn’t be retrieved, but if it has 1,2,3,4 then it should.Code above doesn’t return correct result. Appreciate any help.

Tags:

2

Answers


  1. 0

    Maybe you forgot to put array $tagIds to your query. I hope it works

    Post::whereDoesntHave('tags', function ($query) use ($tagIds) {
     $query->whereIn('tags.id', $tagIds);
})

    or

    Post::whereHas('tags', function ($query) use ($tagIds) {
     $query->whereNotIn('tags.id', $tagIds);
})
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  2. 0

    The query that would accomplish the examples you give is:

    use AppModelsPost;
use IlluminateDatabaseEloquentBuilder;

$tagIds = [1, 2, 3];

Post::query()
    ->whereHas('tags', function (Builder $query) use ($tagIds): void {
        $query->whereKeyNot($tagIds);
    })
    ->get();

    But consider that this query just gives you those posts that has at least one tag that is not in the array. So, by example, a post with zero tags will be returned.

    If you don’t want that behavior, we need to make it a little bit more complex:

    Post::query()
    ->whereHas('tags', function (Builder $query) use ($tagIds): void {
        $query->whereKeyNot($tagIds);
    })
    ->orWhereHas('tags', function (Builder $query) use ($tagIds): void {
        $query->whereKey($tagIds);
    }, operator: '<', count: count($tagIds))
    ->get();

    This query gives you those posts that don’t have exactly the tags in the array.

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