I can't select columns in eager loading using Many To Many Polymorphic relations
My request is :
Etape::with(array('entreprises'=> function($query) {
return $query->select('entreprises.id');
}))->get();
The relations are defined as following
class Etape extends Eloquent {
public function entreprises()
{
return $this->morphedByMany('Entreprise', 'etapeable')->withPivot('date');
}
}
class Entreprise extends Eloquent {
public function etapes() {
return $this->morphToMany('Etape', 'etapeable')->withPivot('date')->orderBy('date');
}
}
These SQL requests are executed :
SELECT * FROM `etapes` WHERE `etapes`.`deleted_at` IS NULL
SELECT `entreprises`.`id`, `entreprises`.*, `etapeables`.`etape_id` as `pivot_etape_id`, `etapeables`.`etapeable_id` as `pivot_etapeable_id`, `etapeables`.`date` as `pivot_date` FROM `entreprises` inner join `etapeables` on `entreprises`.`id` = `etapeables`.`etapeable_id` WHERE `entreprises`.`deleted_at` IS NULL and `etapeables`.`etape_id` in ('12', '13', '14') and `etapeables`.`etapeable_type` = 'Entreprise'
As you can see the second request begins with:
SELECT `entreprises`.`id`, `entreprises`.*
So the select method is not taken into account. Is this a Laravel bug or is there an other solution for this issue?
This isn't supported by Laravel (neither 4.* nor 5.*).
Take a look at the issue created by #edi9999: where Taylor Otwell states:
This is a known issue. We don't allow "selects" on by-many relationships.
There is another issue (created at the end of 2013) where Taylor says
We don't currently support limiting the selects on those relations because if it's not done properly it can break the query. You can remove the columns once the data has been retrieved if you like.
Related
What i want to achieve?
Show user which pacts he is following.
What I am trying
I have designed two tables which are 'pacts' & 'pacts_follwers'
Table 'pacts' has the details of all the pacts
Table 'pacts_follwers' has details of users following a particular pact.
These links will give you the images of both the tables
For Schema Refer Images
So how to get pacts that user is following.
What I have tried?
Sql Query
SELECT pacts.*, (SELECT pactsid FROM pacts_follwers WHERE pacts.id = pacts_follwers.pactsid
and pacts_follwers.userid = 2 ) as pactID FROM `pacts`
Sql query Result
This query will give pactId some value, where the value is null means the user is not following that pact. If this is the solution then i would need Eloquent for this which i am unable to make.
1st table pacts
id
title
about
created_at
updated_at
pactsImage
2nd table pacts_follwers
id
pactsid
userid
created_at
updated_at
Controller Code
$pacts = DB::select("SELECT pacts.*, (SELECT pactsid FROM pacts_follwers WHERE pacts.id =
pacts_follwers.pactsid and pacts_follwers.userid = ".Auth::id()." ) as pactID FROM `pacts`");
You need to setup hasManyThrough relationship for User and Pact.
class User extends Model {
public function pacts() {
return $this->hasManyThrough(
Pact::class,
PactFollower::class
'userid',
'pactsid'
);
}
}
I don't fully understand if you want to achieve "get user's all pacts" or "if pact is followed by user". Either way, you need to setup related relationships.
Or really simple (and not efficient way)
class Pact extends Model {
public function followers() {
return $this->hasMany(PactFollower::class, 'pactsid')
}
}
Now you can use something like
$userIdsForPact = Pact::followers()->pluck('userid');
if ($userIdsForPact->has($user->id)) {
// your operation
}
Edit: For "if pact is followed by user", you need to setup belongsToThrough relationship. It doesn't come out of the box with Laravel but staudenmeir/belongs-to-through package should serve you well.
After setting the relationship properly, you can use something like this.
Pact::with('user')->get();
Or add some methods in your Pact model:
public function followedByUser($user) {
return $this->users->has($user);
}
I want to use sophisticated SELECT query with JOINs and GROUP BY in Laravel model.
Сoncretely I want to make a messager in my application. Here is table "messages" with all messages. Now I want to create model called "Dialog". Keep in mind here is no table "dialogs", a dialog is a result of joining and grouping.
Example of query:
SELECT
cl.name AS client_name,
COUNT(m.id) AS messages_count,
MAX(m.created_at) AS last_message,
COUNT(m.id) > SUM(m.viewed_by_client) AS has_new_for_client,
COUNT(m.id) > SUM(m.viewed_by_user) AS has_new_for_user
FROM messages AS m
INNER JOIN clients AS c ON m.client_id = c.id
GROUP BY c.id
Of cource I can use raw SQL queries. But I want to use Eloquent relations later with all its benefits. For example:
$dialog->client->full_name
$dialog->client->order->ordered_items
I had an idea to create a VIEW in database from my query and to use this view as a fake table in the model. But it seems to me not ideal solution.
So, how can I use JOINs and GROUP BY in Eloquent when I do not have a real table for model entities? Or may be some different solutions for my task?
You can have a database table without an Eloquent model but not the other way around. That said, there's no rule against making more than 1 model per table. Not really standard practice though.
I experimented with making a model that would inherit from another model but the boot method didn't work as expected so I dropped it.
I think you could get all the information you take from that query with accessors in your Client model. Since your query has no where clause, a scope is not really necessary but it could also be done with that.
OPTION 1: Accessors
# App\Client
class Client extends Model
{
// Standard Eloquent relationship
public function messages()
{
return $this->hasMany(App\Message::class);
}
// Accessor $client->client_name
public function getClientNameAttribute()
{
return $this->name;
}
// Accessor $client->last_message
public function getLastMessageAttribute()
{
// Load relationship only if it hasn't been loaded yet
if(!$this->relationshipLoaded('messages'))
$this->load('messages');
// use max() method from collection to get the results
return $this->messages->max('created_at');
}
// Accessor $client->has_new_for_client
public function getHasNewForClientAttribute()
{
// Load relationship only if it hasn't been loaded yet
if(!$this->relationshipLoaded('messages'))
$this->load('messages');
return $this->messages->count() > $this->messages->sum('viewed_by_client');
}
// Accessor $client->has_new_for_user
public function getHasNewForUserAttribute()
{
// Load relationship only if it hasn't been loaded yet
if(!$this->relationshipLoaded('messages'))
$this->load('messages');
return $this->messages->count() > $this->messages->sum('viewed_by_user');
}
}
And then you can access all the properties dynamically
$dialog = Client::withCount('messages')->find($id);
$dialog->client_name;
$dialog->messages_count;
$dialog->has_new_for_client;
$dialog->has_new_for_user;
$dialog->last_message;
However if you're converting $dialog to an array or json format, accessors will be lost unless you append them. In the same way, you can hide the attributes you don't want to show.
This can be done globally for the model
protected $appends = ['client_name', 'has_new_for_client', 'has_new_for_user', 'last_message'];
protected $hidden = ['name'];
or locally for the query
$dialog->setHidden(['name']);
$dialog->setAppends(['client_name', 'has_new_for_client', 'has_new_for_user', 'last_message'];
OPTION 2: Query scopes
# App\Client
class Client extends Model
{
public function scopeDialog($query)
{
$query->select('name as client_name')
->withCount('messages') // the default name will be messages_count
->selectRaw('max(m.created_at) as last_message')
->selectRaw('count(m.id) > sum(m.viewed_by_client) as has_new_for_client')
->selectRaw('count(m.id) > sum(m.viewed_by_user) as has_new_for_user')
->join('messages as m', 'm.client_id', 'clients.id')
->groupBy('clients.id');
}
}
And then just call it like you would any scope Client::dialog()->...
OPTION 3: Just use whatever methods are already available instead of writing more logic
$dialog = Client::with('messages')->find($id);
// client_name
$dialog->name
// messages_count
$dialog->messages->count()
// last_message
$dialog->messages->max('created_at')
// has_new_for_client
($dialog->messages->count('id') > $dialog->messages->count('viewed_by_client'))
// has_new_for_user
($dialog->messages->count('id') > $dialog->messages->count('viewed_by_user'))
Create dialogs table and put 'dialog_id' column into the messages table. Each message has a dialog and a client. Create relationships in each model. So you can access attributes over models as you want. By doing this, this code works;
$dialog->client->full_name
$dialog->client->order->ordered_items
I am trying to detail example about how to get User Model's Accessor in another model with using relationship
Suppose, we have User table & Comment Table...
Now, Suppose I appends User's Profile Full URL in User model using "getProfilePhotoUrlAttribute" Method. when I call User model eloquent then it's appends User Profile Image automatically.
but Now I wants to get that user's profile Full URL in with Comments then we can't access Accessor using Join because with join we can join only out DataBase's Table Columns. If we have profile_photo_path column & doesn't have profile_photo_url named column as we define accessor function name then we can't access using jjoin. in this case we wants to use Relationship method
For example:-
Case :- 1 You wants to Get the user's comments with User details
In this case, User have one or more than one comments So we need to use One TO Many Relation
App/Models/User.php file
/**
* The accessors to append to the model's array form.
*
* #var array
*/
protected $appends = [
'profile_photo_url',
];
/**
* Get the URL to the user's profile photo.
*
* #return string
*/
public function getProfilePhotoUrlAttribute()
{
... here return full profile URL (concat profile_path with storage/public location path)...
}
/**
* Get the user's comments with User details.
*
* One To Many relation
*/
public function comments()
{
return $this->hasMany(Comment::class);
}
Now then, use Model eloquent Query like below
$user = User::with('comments')->where('id', '=', '2')->get();
echo '<pre>';
print_r($user->toarray());
Case :- 2 You wants to Get the user details of the all comments.
In this case, we need to use Many TO One Relation
App/Models/Comment.php file
/**
* Get the user details of the comments.
*
* One To Many (Inverse) / Belongs To
*/
public function user()
{
return $this->belongsTo(User::class);
}
then use Model eloquent Query like below
$comments = Comment::where('deal_id', '=', '45')->get();
print_r($comments->toarray());
foreach ($comments as $comment) {
print_r($comment->user->toarray());
echo $comment->user->profile_photo_url;
echo "<br/>";
}
NOTE:- I used Latest version - it is Laravel 8, So Syntax may vary as per your Laravel Version
For More Detail with Output Data check here my answer on another question
& you can check it in Laravel Official Documentation
I have two models
model_1
model_2
model_1 has many model_2
Now I want to association model_1 hasMany model_2 match with multiple column.
Let me give an example in raw query
select ...... from model_1 left join model_2 ON (model_1.f1 = model_2.f1 AND model_1.f2 = model_2.f2)
How can I do this in hasMany association
I faced this situation while dealing with a pre existing schema. I came up with this solution
After installing Compoships and configuring it in your models model_1 and model_2, you can define your relationships matching multiple columns.
In model_1:
public function model_2()
{
return $this->hasMany(model_2::class, ['f1', 'f2'], ['f1', 'f2']);
}
In model_2:
public function model_1()
{
return $this->belongsTo(model_1::class, ['f1', 'f2'], ['f1', 'f2']);
}
Compoships supports eager loading.
I got it to work by adding an additional parameter to join on in the model:
public function my_joined_columns($mySecondJoinColumnValue)
{
return $this->hasMany('NamespaceToOtherModel', 'myIdColumn')
->where('my_second_join_column', $mySecondJoinColumnValue);
}
And then I make sure I pass in the parameter:
MyModel1::find(1)->my_joined_columns(2)->get()
I have following code:
class Ingredient extends Eloquent
{
public function units()
{
return $this->hasMany('IngredientUnit')
->orWhere('ingredient_id', '=', -1);
}
}
I would expect query like:
select * from `ingredient_units` where `ingredient_id` = '-1' OR `ingredient_units`.`ingredient_id` in (...)
instead I get:
select * from `ingredient_units` where `ingredient_id` = '-1' and `ingredient_units`.`ingredient_id` in (...)
Why it use AND operator instead OR, when I used orWhere()?
Update 1:
And second question is how can I get a query which I was expected?
Update 2:
I want to use eagerloading for that
When you fetch a collection of objects through a relation on a model, the relation constraint is always included, hence the AND. And it makes perfect sense, otherwise you could get $model->units objects that are not related to $model.
I can see what you're trying to achieve here - fetch units related to that $model together with units not related to any models. You can achieve it by adding the following method to your model:
public function getAllUnits() {
$genericUnits = IngredientUnit::whereIngredientId(-1);
return $this->units()->union($genericUnits)->get();
}
OR
public function getAllUnits() {
return IngredientUnit::whereIn('ingredient_id', [$this->id, -1])->get();
}
The only issue here is that it won't be used by eager loading logic but would result in separate query for every model for which you want to return units. But if you always fetch that for a single model anyway, it won't be a problem.
One suggestion: store NULL in ingredient_id instead of -1. This way you'll be able to make use of foreign key constraints.
Is it possible to have a hasMany relationship on two columns?
My table has two columns, user_id and related_user_id.
I want my relation to match either of the columns.
In my model I have
public function userRelations()
{
return $this->hasMany('App\UserRelation');
}
Which runs the query: select * from user_relations where user_relations.user_id in ('17', '18').
The query I need to run is:
select * from user_relations where user_relations.user_id = 17 OR user_relations.related_user_id = 17
EDIT:
I'm using eager loading and I think this will affect how it will have to work.
$cause = Cause::with('donations.user.userRelations')->where('active', '=', 1)->first();
I don't think it's possible to do exactly what you are asking.
I think you should treat them as separate relationships and then create a new method on the model to retrieve a collection of both.
public function userRelations() {
return $this->hasMany('App\UserRelation');
}
public function relatedUserRelations() {
return $this->hasMany('App\UserRelation', 'related_user_id');
}
public function allUserRelations() {
return $this->userRelations->merge($this->relatedUserRelations);
}
This way you still get the benefit of eager loading and relationship caching on the model.
$cause = Cause::with('donations.user.userRelations',
'donations.user.relatedUserRelations')
->where('active', 1)->first();
$userRelations = $cause->donations[0]->user->allUserRelations();
Compoships adds support for multi-columns relationships in Laravel 5's Eloquent.
It allows you to specify relationships using the following syntax:
public function b()
{
return $this->hasMany('B', ['key1', 'key2'], ['key1', 'key2']);
}
where both columns have to match.
I'd prefer doing it this way:
public function userRelations()
{
return UserRelation::where(function($q) {
/**
* #var Builder $q
*/
$q->where('user_id',$this->id)
->orWhere('related_user_id',$this->id);
});
}
public function getUserRelationsAttribute()
{
return $this->userRelations()->get();
}
If anyone landed here like me due to google:
As neither merge() (as suggested above) nor push() (as suggested here) allow eager loading (and other nice relation features), the discussion is still ongoing and was continued in a more recent thread, see here: Laravel Eloquent Inner Join on Self Referencing Table
I proposed a solution there, any further ideas and contributions welcome.
You can handle that things with this smart and easy way .
$cause = Cause::with(['userRelations' => function($q) use($related_user_id) {
$q->where('related_user_id', $related_user_id);
}])->where('active', '=', 1)->first();