I am working through the Laravel 4 From Scratch tutorial at https://laracasts.com/series/laravel-from-scratch. Tutorial 4: Database Access describes several methods for retrieving data from a database.
One in particular I cannot get to work:
In my routes.php, I have
Route::get('/', function()
{
$bottle = DB::table('bottle')->find(1);
dd($bottle);
});
The only output is the "Whoops, looks like something went wrong." page. In the bottle table of my database, the primary key has the name bottle_ID. I would guess this has something to do with the problem, but I cannot find any information on how to change the find() parameter. So how do I use 'find' to return an object from my database?
The following code does work:
// returns everything from bottle table
$bottles = DB::table('brewery')->get();
return $bottles;
// returns all data for the bottle with an ID of 10
$bottle = DB::table('bottle')->where('bottle_ID', '=', 10)->get();
return $bottle;
// returns all ales from the database
$bottles = DB::table('bottle')->where('beer_type', '=', 'Ale')->get();
return $bottles;
When used in the query builder (DB::table()...) the find() method has the primary key column hardcoded as id:
public function find($id, $columns = array('*'))
{
return $this->where('id', '=', $id)->first($columns);
}
What you should do instead is use where() and first():
$bottle = DB::table('bottle')->where('bottle_ID', 1)->first();
Or if you decide to use Eloquent Models you can specify the key column name:
class Bottle extends Eloquent {
protected $primaryKey = 'bottle_ID';
}
And retrieve the model like this:
$bottle = Bottle::find(1);
Related
I'm new to Laravel. I am developing a project. and in this project I have 4 tables related to each other
-Users
-Orders
-OrderParcels
-Situations
When listing the parcels of an order, I want to get the information of that order only once, the user information of that order once again, and list the parcels as a table under it. so far everything ok. but I also want to display the status of the parcels listed in the table as names. I couldn't add the 4th table to the query. do you have a suggestion? I'm putting pictures that explain the structure below.
My current working code is
$orderParcels = Orders::whereId($id)
->with('parcels')
->with('users:id,name')
->first();
and my 'orders' model has method
public function parcels(){
return $this->hasMany(OrderParcels::class);
}
public function users(){
return $this->hasOne(User::class,'id','affixer_id');
}
Note[edit]: I already know how to connect like this
$orderParcels = DB::table('order_parcels as op')
->leftjoin('orders as o','op.orders_id','o.id')
->leftjoin('users as u','o.affixer_id','u.id')
->leftjoin('situations as s','op.status','s.id')
->select('op.*','o.*','u.name','s.situations_name')
->where('op.orders_id',$id)->get();
but this is not working for me, for each parcels record it returns me orders and user info. I want once orders info and once user info.
Laravel provides an elegant way to manage relations between models. In your situation, the first step is to create all relations described in your schema :
1. Model Order
class User extends Model {
public function parcels()
{
return $this->hasMany(OrderParcels::class);
}
public function users()
{
return $this->hasOne(User::class,'id','affixer_id');
}
}
2. Model Parcel
class Parcel extends Model {
public function situations()
{
return $this->hasOne(Situation::class, ...);
}
}
Then, you can retrieve all desired informations simply like this :
// Retrieve all users of an order
$users = $order->users; // You get a Collection of User instances
// Retrieve all parcels of an order
$parcels = $order->parcels; // You get a Collection of User instances
// Retrieve the situation for a parcel
$situations = $parcel->situations // You get Situation instance
How it works ?
When you add a relation on your model, you can retrieve the result of this relation by using the property with the same name of the method. Laravel will automatically provide you those properties ! (e.g: parcels() method in your Order Model will generate $order->parcels property.
To finish, in this situation where you have nested relations (as describe in your schema), you should use with() method of your model to eager load all the nested relation of order model like this :
$orders = Orders::with(['users', 'parcels', 'parcels.situations'])->find($id)
I encourage you to read those stubs of Laravel documentation :
Define model relations
Eager loading
Laravel Collection
Good luck !
Use join to make a perfect relations between tables.
$output = Orders::join('users', 'users.id', '=', 'orders.user_id')
->join('order_parcels', 'order_parcels.id', '=', 'orders.parcel_id')
->join('situations', 'situation.id', '=', 'order_parcels.situation_id')
->select([
'orders.id AS order_id',
'users.id AS user_id',
'order.parcels.id AS parcel_id',
'and so on'
])
->where('some row', '=', 'some row or variable')->get();
I have a service model in October CMS.
In this model, I need to get postman's users (postman is user group) but I am receiving this error:
Trying to get property of non-object
This is my code
public function getPostmanIdOptions()
{
$groups = UserGroup::where('id','4')->lists('name', 'id');
$groups->users;
$list = [' ' => 'choose'] + $groups;
return $list;
}
At the moment, your lists() function will only return the name and the id of each user group. This is used to return thelselect options for the backend select (I am assuming).
What you need to do in this case is return the record based on its id which can be done using the find() eloquent method.
By doing this, the full UserGroup model will be returned, with it's relationships etc.
You're new code should look something like this:
...
$group = UserGroup::find(4);
$users = $group->users;
...
After retrieving the users, you can then using the lists() method if required to:
$list = $group->users->lists('name', 'id');
I am trying to retrieve the thumb image path by joining the images table to the listing table. As such, I have the following query in my controller.
$listings = Listing::select('listings.*, images.path as image_path')
->where('listings.ownerid', '=', $ownerid)
->leftJoin('images', 'listings.thumbId', '=', 'images.id')->get();
After testing out the function, the query fails since laravel interprets the query as
select `listings`.`*, images`.`path` as `image_path` from `listings` left join `images` on `listings`.`thumbId` = `images`.`id` where `listings`.`ownerid` = 1)
Notice the asterisk (*) is joined with the ", images" word making it '*, images'.
The query works fine without laravel's odd typo. How does one fix this issue?
You need to do one change in your query. You are passing raw select fields so you need to use selectRaw() instead of select(). Like
$listings = Listing::selectRaw('listings.*, images.path as image_path')
->where('listings.ownerid', '=', $ownerid)
->leftJoin('images', 'listings.thumbId', '=', 'images.id')->get();
check by try above query.
I suggest you to use Laravel Eloquent Relationships feature. Since your code above is more like Query Builder rather than Eloquent. Let's see the example bellow:
You will have 2 Models, 1 for each table (listings, images):
App\Listing Model:
<?php
...
use App\Image;
class Listing extends Eloquent {
...
protected $table = 'listings';
// define Eloquent Relationship of Listing model to Image model
public function image() {
return $this->belongsTo(Image::class, 'thumbId');
}
...
}
App\Image Model:
<?php
...
use App\Listing;
class Image extends Eloquent {
...
protected $table = 'images';
...
// define Eloquent Relationship of Image model to Listing model
public function listings() {
return $this->hasMany(Listing::class, 'thumbId');
}
}
So how to get the data?
// get all listing data
$listings = Listing::all();
// loop through the data
foreach ($listing as $listing) {
dump($listing->id);
// because we have define the relationship, we can access the related data of image
dump($listing->image->path);
// call $this->image will return related Image model
dump($listing->image);
}
You can see Laravel official documentation for more example and explanation.
Hope it helps.
I'm trying to build an app in Laravel 5.3, I want to add additional column data in the pivot table. Following is my code:
My Users model:
public function relations()
{
return $this->belongsToMany('App\Plan')->withPivot('child');
}
My Plan model:
public function relations()
{
return $this->belongsToMany('App\User')->withPivot('child');
}
In my controller I'm fetching the user data from Auth::user(); and for plans and child element I'm getting through request. I want to store this to my pivot table. Following is the code which I tried in my controller:
$user = \Auth::user();
$plan_id = $request->plan_id;
$childid = $request->child_id;
$plan = App\Plan::find($plan_id);
$user->relations()->attach($plan, ['child' => $childid]);
Help me out in this.
You should use attach() like this:
$user->relations()->attach($plan_id, ['child' => $childid]);
Try the save method as:
$user->relations()->save($plan, ['child' => $childid]);
Docs
Both save and attach work. Just that attach will return null while save will return $user object when I try with tinker
I'm new to Laravel and I'm stuck. This is what I am struggling with:
$questions = Question::find($id)->quiz(); // this code retrieves data from
// the table using the primary key
// in the table. The is a parameter
// that is passed via get.
This is what I have right now:
$questions = Question::where('quiz_id', '=', $id)->quiz();
This is the error I get:
Call to undefined method Illuminate\Database\Query\Builder::quiz()
What I want to do:
I want to run a query to get data from my database table using the foreign key in the table not the primary key, I also want to be able to use relations with this as seen from what I tried to do above.
Edit: Added the Question Model
<?php
class Question extends Eloquent{
protected $table = 'quiz_questions';
public function quiz()
{
return $this->belongsTo('Quiz');
}
}
Calling the quiz() function from Question::find($id)->quiz() will return a Query Builder instance allowing you to query the parent of the Question, its not going to return any data at that point until you call ->get() or another method that actually executes the query.
If you're wanting to return all the questions belonging to a certain quiz then you can do it like this.
$questions = Question::where('quiz_id', $id)->get();
This will return an Eloquent\Collection of the results for all questions with a quiz_id that is equal to $id.
If you've setup the relations between the Quiz and Questions then you can also do this using the Laravel relations.
$quiz = Quiz::findOrFail($id);
foreach($quiz->questions as $question)
{
// Do stuff with $question
}
Laravel will automagically pull Questions from the database that belongTo the Quiz you've already got from the database, this is known as eager loading http://laravel.com/docs/4.2/eloquent#eager-loading
Wader is correct, just calling where() will not execute your query. You either call get() and get an iterable result or use first() if you only want one result.
$quiz = Question::where('quiz_id', '=', $id)->first()->quiz();