Laravel Eloquent distinct values

问题

PROBLEM SOLVED.

I'm trying to get an person's books, but there are more than one book in my book table since there are different editions of a book. When I list all books of a person, I shouldn't list duplicates.

Here's what I've done so far

Person Model

public function books() {
    return $this->belongsToMany('\App\Models\Thing', 'bookxauthor', 'person_id', 'thing_id');
}

PersonController.php

$allbooks = Person::find($id)->books;  

This is great, it lists all the books of an author, but I don't need duplicates.

The query below works. type_id means it's a book.

$findBooks = Person::with(array('books' => function($query)
            {
                $query->where('type_id',"=",3)->groupBy('original_name');
            }))->find($id);

            $allbooks = $findBooks->books;

回答1:

You could use the groupBy function for collections Eg.

$allbooks = Person::find($id)->books->groupBy('name')->get();

回答2:

The query below works.

$findBooks = Person::with(array('books' => function($query)
            {
                $query->where('type_id',"=",3)->groupBy('original_name');
            }))->find($id);

            $allbooks = $findBooks->books;

来源：https://stackoverflow.com/questions/32416110/laravel-eloquent-distinct-values