laravel中的位置和查找之间有什么区别

Question

when I write this $thread = Thread::find($id); then I write {{$thread->title}} it gives me the title of the thread, but when I write $thread = Thread::where('id','=',$id); then I write {{$thread->title}} it gives me an error.why is that happening?

Answer 1

You should write:

$thread = Thread::where('id','=',$id)->first();

to get one column, else laravel will understand it as array.

Answer 2

You need to call the get() (or any of its variants) method to execute the actual query when using where.

   Thread::where('id','=',$id)->get();

Otherwise Thread::where('id','=',$id) just gets you an instance of eloquent's query builder.

find() on the other hand will automatically run a query for whatever it is you want to find by you can't do all sorts of useful stuff (eg orderBy, paginate, etc.) that you can very easily pull of using the query builder.