I used last laravel ver. framework. I can't get access to a certain record. I have two field links to one table.
My migration:
Schema::create('application_forms', function (Blueprint $table) {
$table->unsignedBigInteger('clients_id');
$table->foreign('clients_id')->references('id')->on('clients')->onDelete('cascade');
$table->unsignedBigInteger('buyer_id')->nullable();
$table->foreign('buyer_id')->references('id')->on('clients')->onDelete('cascade');
My model
class Application_form extends Model
{
public function clients()
{
return $this->belongsTo(Client::class);
}
I used on my blade
{{$application_form->clients->FIO_Client}}
But I can't access to record with buyer_id. I get record with clients_id. How I can get access to this
$table->unsignedBigInteger('buyer_id')->nullable();
$table->foreign('buyer_id')->references('id')->on('clients')->onDelete('cascade');
Related
i have a table called order_details which is having two foreign keys.
(1.) order_id
(2.) product_id
i have compacted the whole table in my view. when i access the records related to order they are working well but when i try to access the record of products which are foreign as product_id in order_detail table i am getting null.
Table of OrderDetails:
Schema::create('order_details', function (Blueprint $table) {
$table->bigIncrements('id');
$table->unsignedBigInteger('order_id');
$table->foreign('order_id')->references('id')->on('orders');
$table->unsignedBigInteger('product_id');
$table->foreign('product_id')->references('id')->on('products');
$table->integer('quantity');
$table->integer('amount');
$table->timestamps();
});
Model of OrderDetail:
public function order(){
return $this->belongsTo(Order::class);
}
public function products(){
return $this->hasMany(Product::class);
}
Model of Order:
public function orderDetails(){
return $this->hasMany(OrderDetail::class);
}
Model of Product:
public function orderDetail(){
return $this->belongsTo(OrderDetail::class);
}
i have compacted the whole table in $orderDetails on my view. when i try to access data of Order table like this:
$orderDetails[0]->Order['total_ammount']
its working fine as it is accessing the order model through order_id. but with the same way i try to get data from Product Model using product_id like this
$orderDetails[0]->Product['name']
its showing me no error but null.
Can you try be correcting these relations
OrderDetail Model
// individual row of order_details belongs to single product
public function product(){
return $this->belongsTo(Product::class);
}
Product Model to OrderDetail
I don't think this relation will be required as it hasto pass through User Model. Even though correct it as
public function orderDetails() {
return $this->hasMany(OrderDetail::class);
}
I have an interface which displays a list of communities on the platform. Communities have members and in turn members/profiles can befriend one another. On the listing page each community card needs to display the number of members (in the community) and the number of friends (friends of logged in profile) from those members.
Here's an illustration of how a community card looks like
I'm getting the communities with the members first:
$communities = $loggedInProfile->communities->load('members')->take(15);
And then iterating over the communities and then the members to find out which ones are friends with the logged in user.
foreach ($communities as $key => $community) {
$friends = [];
foreach ($community->members as $member) {
if ($loggedInProfile->isFriendWith($member)) {
array_push($friends, $member);
}
}
$community->members_who_are_friends = $friends;
}
My issue is that this is very taxing in terms of the number of queries when the associations get large. Is there a better way of retrieving these relationships without having to use nested for loops? I'm also indexing all data with Elasticsearch. Would a retrieval of this sort be better with Elasticsearch? Also would this be a good use case for hasThrough?
Update
The members relationship:
public function members()
{
return $this->belongsToMany('App\Profile', 'community_members', 'community_id', 'profile_id')->withTimestamps();
}
The isFriendWith relationship:
public function isFriendWith(Model $recipient)
{
return $this->findFriendship($recipient)->where('status', Status::ACCEPTED)->exists();
}
The check is done on a table called friendships. The status column (which can be either 0 or 1) is checked to see if friends or not.
The findFriendship check:
private function findFriendship(Model $recipient)
{
return Friendship::betweenModels($this, $recipient);
}
Database structure:
-Profiles migration
Schema::create('profiles', function (Blueprint $table) {
$table->increments('id');
$table->unsignedInteger('user_id');
$table->foreign('user_id')->references('id')->on('users');
});
-Communities migration (the foreign key is the owner of the community)
Schema::create('communities', function (Blueprint $table) {
$table->increments('id');
$table->unsignedInteger('profile_id');
$table->foreign('profile_id')->references('id')->on('profiles');
$table->string('slug')->unique();
});
-Community_members migration
Schema::create('community_members', function (Blueprint $table) {
$table->primary(['profile_id', 'community_id']);
$table->unsignedInteger('profile_id');
$table->foreign('profile_id')->references('id')->on('profiles');
$table->unsignedInteger('community_id');
$table->foreign('community_id')->references('id')->on('communities');
$table->timestamps();
});
-Friendships migration
Schema::create('friendships'), function (Blueprint $table) {
$table->increments('id');
$table->morphs('sender');
$table->morphs('recipient');
$table->tinyInteger('status')->default(0);
$table->timestamps();
});
In your line:
$communities = $loggedInProfile->communities->load('members')->take(15);
load() is used to perform Lazy Eager loading, i.e. you load the members after the communities have been retrieved, resulting in a different query for every community. You could extract the whole data with a single query using with(). Also, take(15) is performed on the resulting collection and not on the query. Try this:
$communities = $loggedInProfile->communities()->with('members')->take(15)->get();
In the Models of a many to many relationship I have accidentally identified the foreign key names in reverse. This is done in both related Models so the relationship works. It's in production.
In Articles:
public function categories()
{
return $this->belongsToMany(ArticleCategory::class, 'article_category_article', 'article_category_id', 'article_id');
}
and in ArticleCategory:
public function articles()
{
return $this->belongsToMany(Article::class, 'article_category_article', 'article_id', 'article_category_id');
}
As you can see, both foreign keys are reversed.
It doesn't bother me because it works throughout the project. In the article_category_article table both values are recorded in the 'wrong' column.
But what if I'd like to swap it anyway. The Models are easy, but what about the pivot table? I have tried with a laravel migration:
public function up()
{
Schema::table('article_category_article', function (Blueprint $table) {
$table->renameColumn('article_id', 'temporarily');
$table->renameColumn('article_category_id', 'article_id');
$table->renameColumn('temporarily', 'article_category_id');
});
}
without success, it predictably runs into the error There is no column with name 'temporarily' on table 'article_category_article'
Splitting it up in 2 migration files ran into the same error.
I have the tendency to let it be. The question is: can it be done? I presume swapping the columns inside MySQL (without migrations), re-index the tables and adapt the Models is a possibility. Any ideas? I can test it out on a local server.
Two separate queries work for me:
public function up()
{
Schema::table('article_category_article', function (Blueprint $table) {
$table->renameColumn('article_id', 'temporarily');
$table->renameColumn('article_category_id', 'article_id');
});
Schema::table('article_category_article', function (Blueprint $table) {
$table->renameColumn('temporarily', 'article_category_id');
});
}
I have two table witch named users & Inbox
In the Inbox table I have a column named sender_id that have the user_id of the sender
I want to show this message in the view. I need a query to get the sender_id from the inbox table and use that to select a certain user from the users table
I need to do this with all messages and all users.
Laravel is basicly straith foward when you use eloquent. You can always customise it.
First, almost all the time, I create a model and a migration at the same time using this : php artisan make:model Something --migration
I know you already make some models and/or migrations, but I'll go step by step to help you understand it.
So, in your case, it'll be php artisan make:model User --migration and php artisan make:model Inbox --migration. Doing this, you get two model named User and Inbox and two migration named date_create_users_table.php and date_create_inboxs_table.php. Maybe you already did the default user table with php artisan make:auth. If it's the case, don't remake one.
I'm not sure about how laravel will name the Inbox model migration... Since, I think, Laravel 5.3, the plurialisation changed and don't always just add an "S" at the end.
Then, now you got your models and migrations, let's add some line into your migration files. Since you want to do a one to many relationship. You don't need to touch the user one. Only the Inbox migration. Each Inbox is related to one User and Users can have many Inboxs. Add something like this in your migration:
public function up()
{
Schema::create('inboxs', function (Blueprint $table) {
$table->increments('id');
$table->integer('user_id');
$table->foreign('user_id')->references('id')->on('users');
all other columns...
});
}
There, you can change the column's name if you need to have a sender, a recipient, etc... Do this instead :
public function up()
{
Schema::create('inboxs', function (Blueprint $table) {
$table->increments('id');
$table->integer('sender_id');
$table->foreign('sender_id')->references('id')->on('users');
$table->integer('recipient_id');
$table->foreign('recipient_id')->references('id')->on('users');
all other columns...
});
}
What we just did, it's creating the Foreign key that Laravel will use to build the query. There is one last part before the fun one. We need to create the relation in our Model. Begin with the user one:
App/User.php
public function inboxs() {
return $this->hasMany(Inbox::class);
}
And now into the App/Inbox.php model:
public function user() {
return $this->belongsTo(User::class);
}
If you need to have a Sender/Recipient/etc... go this way instead:
public function sender() {
return $this->belongsTo(User::class);
}
public function recipient() {
return $this->belongsTo(User::class);
}
Note that each of your function need to be writen in the same way it's into your migration. sender_id need a relation named sender().
Now, that our relations are done, we can simply call everything using eloquent.
$inboxs = Inbox::with('sender')->get();
This will return an array of all your Inbox into the inboxs table. You can access the sender this way: $inboxs[0]->sender();
You need the id, do this: $sender_id = $inboxs[0]->sender_id;
The sender name : $sender_name = $inboxs[0]->sender->name;
If you want to get one Inbox and you have the id, just do this $inbox = Inbox::with('sender')->find($id);
This way you don't get an array, only one result and can access the sender directly using $sender_name = $inbox->sender->name; instead of having to add [0] or using a foreach loop.
You can get all messages sended by a user using something like this:
$inboxs = Inbox::where('sender_id', $sender_id)->get();
Finally, you can pass your data to the view using:
return view('path.to.view')->with('inbox',$inbox);
Into the view you do this to show the sender's name:
//If view.blade.php
{{$inbox['sender']['name']}} //work a 100%
{{$inbox->sender->name}} //I'm not sure about this one
//If not using blade
<?php echo $inbox['sender']['name']; ?>
There is a lot of thing you can do using Eloquent and you can add as much condition you want. The only thing I suggest you to really do if you want to use Eloquent, be aware about the n+1 problem. There is a link where I explain it. Look for the EDIT section of my answer.
If you need some documentation:
Laravel 5.3 Relationships
Laravel 5.3 Migrations
Laravel 5.3 Eloquent
I think you should update your code like:
$user_messages = DB::table('messages')
->select('messages.id as msgId','messages.message as message','users.id as userId','users.user_name as user_name')
->join('messages','messages.user_id','=','users.id')
->where('messages.user_id',$user_id)
->get();
return view("view.path")
->with('messages',$user_messages);
Hope this work for you!
In Model :
namespace App;
use Illuminate\Database\Eloquent\Model;
class Messages extends Model
{
protected $table = 'table_name';
public function sender()
{
return $this->belongsTo('App\User', 'sender_id', 'id');
}
}
In Controller :
public function functionName($user_id){
$messages = Messages::where('sender_id', $user_id)->get();
return view("view.path")
->with('messages',$messages);
}
In view, you can access seder details like this $message->sender->name for name for id $message->sender->id
I am trying to save data with eloquent relationship.
I have following three tables: User Table, Category Table and Post Table.
Post Table
Schema::create('posts', function (Blueprint $table) {
$table->increments('id');
$table->integer('category_id')->unsigned();
$table->integer('user_id')->unsigned();
$table->string('heading');
$table->timestamps();
$table->foreign('category_id')->references('id')->on('categories');
$table->foreign('user_id')->references('id')->on('users');
});
Relations:
Category:
public function posts() {
return $this->hasMany('App\Post');
}
Post:
public function user() {
return $this->belongsTo('App\User');
}
public function category() {
return $this->belongsTo('App\Category');
}
User:
public function posts($category) {
return $this->hasMany('App\Post');
}
My Problem is that, how can I save post just by passing the Heading in create function. I want to use the relationship. As an example I want to use this kind of code:
$data = ['heading' => $heading];
$user->posts()->category()->create($data);
Is this possible to do this kind of stuff ?
Or any another simple way to achieve this.
EDIT
I need to create post by using this kind of relationship.
As per the process:
user will fill up the form from which I will get the data along with
the category id.
Now I need to create data for that user related with the given category id.
It's because after you call posts() method you won't get to the model's relation (only the query builder) so you will not access category() relation method. It's because posts are one-to-many relation and you don';t know exacly which record you refer to create data.
EDIT
If you want to create new post entry the the best way to sole this is:
$data = ['heading' => $heading, 'category_id' => $putHereCategoryId];
$user->posts()->create($data);
You'll need to obtain somehow the id of the desire category for the new post's entry.