I am making user to user messaging system in laravel 4. So in a simplified version i have to table
First table
Users
user_id |
user_name
Second table
Messages
message_id |
message_from_user_id |
message_to_user_id |
message_content |
So after reading the documentation I learned that User has many message and message belongs to User.
But how do I actually relate them in coding?
I am quite confused how will I use the foreign key in this case for a message that will have two user?
Check this out: http://laravel.com/docs/eloquent#many-to-many
Basically you need a table structure like this
Users: id | username
Messages: id | from | content
user_messages: user_id | message_id
You can define your models like this
class User extends Eloquent {
public function messages()
{
return $this->belongsToMany('Message');
}
public function sent_messages()
{
return $this->hasMany('Messages', 'from');
}
}
class Message extends Eloquent {
public function from()
{
return $this->belongsTo('User', 'from');
}
public function to()
{
return $this->belongsToMany('User');
}
}
Related
I am using Laravel 5.4. I have 2 tables destination and user and a pivot table destination_user.
destination table
---|------
id | name
---|------
1 | sth
user table
---|------
id | name
---|------
1 | sth
and finally Pivot table
--------------|--------
destination_id| user_id
--------------|--------
1 | 1
2 | 1
3 | 2
I created a model for pivot table named destinationUser.
My destination model looks like this:
<?php
namespace App\models;
use App\Models\User;
use App\Models\DestinationUser;
use App\Models\DestinationImage;
use Illuminate\Database\Eloquent\Model;
class Destination extends Model
{
protected $table = 'destinations';
public function user() {
return $this->belongsToMany('App\Models\User');
}
public function destinationUser() {
return $this->hasMany('App\Models\DestinationUser');
}
}
I want to get all the destinations with their respective user detail using pivot table. I have tried so far is this:
$destinations = $this->destination->with('user', 'destinationUser')
->whereHas('destinationUser', function($query) {
$query->where('user_id', user()->id);})
->paginate(20);
dd($destinations[0]->destinationUser); gives me destination id and user id but I want user detail. How can I achieve this. Thank You for your help
You need a many to many relationship:
class Destination extends Model
{
protected $table = 'destinations';
public function destinationUser() {
return $this->belongsToMany('App\User');
}
}
controller
$destinations = $this->destination->with('destinationUser', function($query) {
$query->where('user.id', user()->id);})
->paginate(20);
As I was searching for faster execution of queries, there was a wrong design of tables. There is more load and time of execution for 3 table with pivot rather than 2 tables without pivot. So, I figured it out and corrected.
I'm using Laravel and I have a problem creating a team with a coach's id using eloquent expressions. I have users (basic users who can become coaches), then I have coaches who can have only one team and lastly teams, which can have 1 or 2 coaches. Their tables:
Users:
id | email | password | coach_id (null is default)
Coaches:
id | user_id | ... (other unnecessary coach info)
Teams:
id | coach_id | ... (other unnecessary team info)
I tried creating a team in TeamController's method (following laravel tutorial on Youtube https://youtu.be/z-1bdYTNWm8?t=6m50s):
$team = new Team();
$team->team_name = $team_name;
$team->organization = $organization;
$team->address = $address;
$request->user()->coach()->team()->save($team);
My user model:
public function coach(){
return $this->hasOne('App\Coach');
}
My coach model:
public function user(){
return $this->belongsTo('App\User');
}
public function team(){
return $this->hasOne('App\Team');
}
My team model:
public function coach(){
return $this->belongsToMany('App\Coach');
}
But i get this error:
BadMethodCallException in Builder.php line 2450:
Call to undefined method Illuminate\Database\Query\Builder::team()
You can try it as:
$team = new Team();
$team->team_name = $team_name;
$team->organization = $organization;
$team->address = $address;
$request->user()->coach->team()->save($team);
Note - Remove the () from coachrelation.
Update
When you add parenthesis () it creates the query builder and you don't have any relation named team in User model, so Laravel throws the error.
But when you do $request->user()->coach it returns the object of Coach model and then you can query it by the relation name team.
I have a table without 'primary ID', ex.
+---------+----------+------------+------------+
| user_id | point_id | created_at | updated_at |
+---------+----------+------------+------------+
And I have records:
1 ..| 200 | (date) | (date)
14 | 300 | (date) | (date)
1 ..| 200 | (date) | (date)
Now I want delete only one record to get:
1 ..| 200 | (date) | (date)
14 | 300 | (date) | (date)
I tryied:
UserPoint::where( 'point_id', $reqId )->where( 'user_id', $userId )->first()->delete();
But it always remove all record with this params ... Anyone can help?
EDIT: My UserPoint model
use Illuminate\Database\Eloquent\Model;
class UserPoint extends Model {
protected $table = 'point_user';
public function scopeUsed($query){
return $query->where('amount', '<', 0);
}
public function scopeEarned($query){
return $query->where('amount', '>', 0);
}
public function about(){
return $this->hasOne('\App\Point', 'id', 'point_id');
}
}
The way you are trying to achieve this deletion is somewhat wrong as it does not follow the rules of data integrity . Deleting a child table in your case would impose what we call an orphaned table.
However the correct way of deleting that record would be to first associate this table to its parent related table in this case as below:
Class User extends Model {
public function points() {
return $this->hasMany(UserPoint::class)
}
}
then in your UserPoint Class or Model you then need to map your relation.
class UserPoint extends Model {
protected $table = 'point_user';
// I have added this part
public function users() {
return $this->belongsTo(User::class)
}
public function scopeUsed($query){
return $query->where('amount', '<', 0);
}
public function scopeEarned($query){
return $query->where('amount', '>', 0);
}
public function about(){
return $this->hasOne('\App\Point', 'id', 'point_id');
}
}
This way you when deleting the Model or Item you can simply do the below:
// Inject your User in the constructor or function - lets say you names it User $user
$user->points->delete();
I suggest you also look at Eloquent's association and sync methods when working with relations this way you always know that the related Models are on sync and there re no orphaned children in the database which in Enterprise Design is a huge problem as accuracy and Data intergrity is everything .
I have 2 tables, a) Photo b) PhotoLike. I am trying to make a relationship between these models so I can use ->with('').
I set up several properly however I don't know why this one is not working.
class PhotoLike extends Model {
public function photo()
{
return $this->belongsTo('App\Photo');
}
}
class Photo extends Model {
public function likes()
{
return $this->hasMany('App\PhotoLike');
}
}
The database structure looks like:
photo_likes table => id | photo_id | owner_id
photos table => id | user_id | ...
So photo_like -> photo_id <=> photos -> id
This is what I am trying to call:
$photos = Photo::with('likes')->where('user_id', $user)->get();
As a result I am getting everything except likes. I am receiving: "likes": []
I'm trying to figure out how I can do a query within a query. (if that even makes sense) I want to grab all the activities. For each activity I want to get the count of users that did the activity. Then I want to order all the activities in DESC order based on the amount of users that did each activity. I'm basically making a "Popular Activities Page" where I show the all activities starting with the activity done by the most users.
I have 3 main tables for this
users
| id | name | password | email | created_at |
activities
| id | title | description | created_at |
resource This is a table I'm using for posts which shows which user did which activity. (Users can show what activities they did, and attach media and locations to the post)
| id | user_id | activity_id | media_id | location_id | created_at |
Here are my models for each table
User Model
class User extends Eloquent {
protected $table = 'users';
/**
* get the activities associated with the given user
* #return mixed
*/
public function activities()
{
return $this->belongsToMany('Acme\Activities\Activity', 'resource', 'activity_id');
}
public function posts(){
return $this->hasMany('Acme\Resource\Resource');
}
public function media()
{
return $this->hasMany('Acme\Media\Media');
}
public function locations()
{
return $this->hasMany('Acme\Locations\Location');
}
}
Activity Model
class Activity extends Eloquent {
protected $table = 'activities';
public function posts(){
return $this->hasMany('Acme\Resource\Resource', 'resource_id');
}
/**
* get the users associated with the given activity card
* #return mixed
*/
public function users()
{
return $this->belongsToMany('Acme\Users\User', 'resource', 'user_id');
}
}
Resource Model
class Resource extends Eloquent {
protected $table = 'resource';
public function user()
{
return $this->belongsTo('Acme\Users\User', 'user_id');
}
public function activities()
{
return $this->belongsTo('Acme\Activities\Activity', 'activity_id');
}
public function media()
{
return $this->hasMany('Acme\Media\Media', 'media_id');
}
public function locations()
{
return $this->belongsTo('Acme\Locations\Location', 'location_id');
}
}
I know I can get all activities using
Activity::get()
I can get a user count for a specific activity using
User::whereHas('resource', function($q) use ($activity_id){
$q->where('activity_id', $activity_id);
})->get()->count();
but I don't know how I can put all of this together in order to get all Activities sorted by user count, starting with the activity with the highest user count.
How would I make this query using eloquent?
Thanks in advance!
try
Resource::select(DB::raw('*, COUNT(distinct(user_id)) as user_count'))->group_by('activity_id')->order_by('user_count', 'desc')->get();
You could then do this
$results = Resource::select(DB::raw('*, COUNT(distinct(user_id)) as user_count'))->group_by('activity_id')->order_by('user_count', 'desc')->get();
foreach ($results as $result) {
$activity = Activity::where('id','=',$result->activity_id)->first();
// do stuff to display data for this activity like
// $activity->title or $activity->description
$count = $result->user_count;
}