I'm getting grade_id from the database:
$grade_id = DB::table('grades')->where('teacher_id',$teacher_id)->select('grade_id')->get();
and then I want to use that grade_id array in the where eloquent clause so I run
$home_feed = Home::join('home_grade', 'home_grade.home_id', '=', 'homes.id')
->whereIn('grade_id', $grade_id)
->get();
but when I run this I'm getting an error: Object of class stdClass could not be converted to string
What could be the problem? Thanks guys.
Depending on laravels version your $grade_id is either an array or a collection of objects. What you need is an array or a collection of values.
You can achieve that using the pluck() method insted of select() like IzzEps suggested.
But you can get the same result by passing a subquery to the whereIn() method:
$gradeSubquery = DB::table('grades')->where('teacher_id',$teacher_id)->select('grade_id');
$home_feed = Home::join('home_grade', 'home_grade.home_id', '=', 'homes.id')
->whereIn('grade_id', $gradeSubquery)
->get();
This way you will run only one query instead of two.
Update: Before version 5.2 you have to use lists() instead of pluck(). And the whereIn() method doesn't accept a Builder as second parameter. To get the same query you would need to use a closure:
$home_feed = Home::join('home_grade', 'home_grade.home_id', '=', 'homes.id')
->whereIn('grade_id', function($query) use($teacher_id) {
$query->from('grades')
->where('teacher_id', $teacher_id)
->select('grade_id');
})
->get();
your first query is returning a collection, not the grade_id.
Try this instead: $grade_id = DB::table('grades')->where('teacher_id',$teacher_id)->pluck('grade_id');
Using lists worked.
$grade_id = Grade::where('teacher_id', $teacher_id)->lists('grade_id');
They return an array instead of a collection
You need to create the array correctly. To do this use two functions that Eloquent work with: pluck() and toArray(). Look at example below:
$grade_id = DB::table('grades')->where('teacher_id',$teacher_id)->pluck('grade_id')->toArray();
Related
How to avoid foreach-loop because Laravel query builder is used to get a single record detail.
When I tried without foreach-loop, the following error occurred "Property [name] does not exist on this collection instance".
Controller
public function show(Student $student)
{
$result = DB::table('students')
->select('*')
->where('id', "=" ,$student['id'])
->get();
foreach($result as $studentData){}
return view('student.show', ['studentData' => $studentData]);
}
Blade View
{{ $studentData->name}}
->get() always returns a Collection, even if there's only one match. If you only want the first record, you can use ->first() instead.
Do you really have to use raw queries? I assume Student is a Laravel Model, in that case, you should be able to use Student::find($id) to get the model directly.
When I use this code in laravel for json where
$users = App\User::where('meta->Address->addressState','4');
Laravel returns an empty collection
Illuminate\Database\Eloquent\Collection {#3909
all: [],
}
How could i solve this issue?
Try using whereJsonContains like
$users = App\User::whereJsonContains('meta->Address->addressState', '4')->get();
or
You can use
$users = DB::table('users')
->where('meta->Address->addressState', '4')
->get();
I think where too work correctly may be you need to remove the quote
$users = App\User::where('meta->Address->addressState', 4)->get();
or
$users = App\User::where('meta->Address->addressState', "'4'")->get();
depend on how you have stored it in your DB.
$users = App\User::where('meta->Address->addressState','4');
$data=$users->first();
This will work if you want only one data from table that have addressState of 4 else if you want multiple data you can try this
$data=$users->get();
I have this code
$users = array();
$users_to_add = User::all()->where('unit', 'LIKE', '%'.$request->unit.'%');
But i get nothing on $users_to_add. The like doesn't work. What am i missing?
all() actually runs a query to get all users. Therefore, your where() call is on the Collection (PHP), not the Query Builder (SQL).
You'll want to use get() but make sure you declare your query conditions prior to calling it.
get() will execute the query, with your defined conditions, and return a collection of results.
User::where('unit', 'LIKE', '%'.$request->unit.'%')->get();
I've been working with Laravel for a short time, and am confused about accessing data retrieved from queries. I'm trying to save data to variable but am getting the following:
Trying to get property of non-object
Queries tried:
$data = DB::table('table_1')->select('user_id', 'email')->where('email', '=', Input::get('email_address'))->get();
// also tried
$data = DB::table('table_1')->where('email', '=', Input::get('email_address'))->pluck('user_id');
// accessing data
$userID = $data->user_id;
Both return the same.
To elaborate a little bit, ->get() will return a Collection. You might iterate over it as an array, but you can profit from methods that this class offers. pluck is one of these.
That's why $userID = $data->user_id; wouldn't work.
first() did the trick, rather than get().
$data = DB::table('table_1')->select('user_id', 'email')->where('email', '=', Input::get('email_address'))->first();
//Earlier in the code, in each Model:
query = ModelName::select('table_name.*')
//Later in the code in a function in a Trait class that is always called
if ($column == 'group_by')
{
$thing_query->groupBy($value);
$thing_query->select(DB::raw('COUNT('.$value.') as count'));
}
Is there a way to append or include a separate select function in the eloquent query builder?
The actual ->select() is set earlier and then this function is called. I'd like to add the count column conditionally in this later function that has the query passed into it.
For future reference, you can use the addSelect() function.
It would be good to have in the documentation, but you'll find it here in the API: http://laravel.com/api/4.2/Illuminate/Database/Query/Builder.html#method_addSelect
Yeah you just insert the block you wanna execute as a function....according to the documentation on Parameter Grouping , you can do like so...by passing the Where a function...
This code below probably wont do what you want, but, its something for you to build off of, and play around with.
DB::table('users')
->where('name', '=', 'John')
->orWhere(function($query)
{
$query->group_by($value);
->select(DB::raw('COUNT('.$value.') as count'));
})
->get();
Try this:
$thing_query->groupBy($value)->get(DB::raw('COUNT('.$value.') as count'));
Also,if you are just trying to get the count and not select multiple things you can use ->count() instead of ->get()