New Features for Querying Polymorphic Relations in Laravel 5.8.27

The Laravel team released v5.8.27 with a whereHasMorph() method to work with polymorphic Eloquent relationships (MorphTo).

The new whereHasMorph() and corresponding methods make it possible to query polymorphic relationships with something like the following:

Comment::whereHasMorph('commentable', [Post::class, Video::class], function ($query) {
    $query->where('title', 'foo');
})->get();

Which produces something like the following query:

select * from "comments"
where (
  (
    "commentable_type" = 'App\Post' and exists (
      select * from "posts" where "comments"."commentable_id" = "posts"."id" and "title" = 'foo'
    )
  ) or (
    "commentable_type" = 'App\Video' and exists (
      select * from "videos" where "comments"."commentable_id" = "videos"."id" and "title" = 'foo'
    )
  )
)

All the examples shown here are from the pull request (#28928) description, which explains it in further detail, so check out the full notes:

By creating a temporary BelongsTo relationship for each type and allowing relationship instances as the first argument of has(), we can reuse most of the existing code.

The type is passed as the second argument to the closure, which simplifies queries with different constraints:

Comment::whereHasMorph('commentable', [Post::class, Video::class], function ($query, $type) {
    if ($type === Post::class) {
        // $query->
    }
 
    if ($type === Video::class) {
        // $query->
    }
});

Last, providing a wildcard as the second argument will let Laravel get the possible types from the database:

Comment::whereHasMorph('commentable', '*', function ($query) {
    $query->where('title', 'foo');
})->get();

Next, the mix asset URL is configurable via the MIX_ASSET_URL environment variable.

Next, you can set the RedisManager default driver with the setDriver() method.

You can see the full list of fixes below, and the whole diff between 5.8.26 and 5.8.27 on GitHub. The full release notes for Laravel 5.8 are available in the GitHub 5.8 changelog:

#v5.8.27

#Added

• Let mix helper use app.mix_url config (#28952)
• Added RedisManager::setDriver() method (#28985)
• Added whereHasMorph() and corresponding methods to work with MorphTo relations (#28928)

#Fixed

• Fixed: Changing a database field to binary include collation (#28975)
• Fixed app.stub for jquery components loading (#29001)
• Fixed equivalent for greek letter theta in Str::ascii() (#28999)

#Changed

• Prevented TestResponse::dump() and TestResponse::dumpHeaders() methods from ending execution of the script (#28960)
• Allowed TestResponse::dump() and TestResponse::dumpHeaders() methods chaining (#28967)
• Allowed to NotificationFake accept custom channels (#28969)
• Replace contents of service manifest atomically (#28973)
• Pass down the serverVersion database connection option to Doctrine DBAL connection (#28964, 1b55b28)
• Replace self:: with static:: in the Relation::getMorphedModel() (#28974)
• Set a message for SuspiciousOperationException (#29000)
• Storing Mailgun Message-ID in the headers after sending (#28994)