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Questions tagged [relation]

A relation on sets S1, S2, ..., SN is any subset of S1 x S2 x ... x SN, where 'x' denotes the Cartesian product. In other words, a relation over N sets is any set of ordered N-tuples over the N sets.

A relation on sets S1, S2, ..., SN is any subset of S1 x S2 x ... x SN, where 'x' denotes the Cartesian product. In other words, a relation over N sets is any set of ordered N-tuples over the N sets.

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Laravel relation data with first() method

Vender hasMany Banquet Here is my query: $banquet = Vendor::with(['banquet' => function($query){ $query->where('active',1)->where('id' ,1)->first(); }])->findOrfail(1); but the relation part return an collection like get() method…
Fan
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How to tackle this Inverse Relation homework?

Here is my assignment: Write a function inverse(rel) that takes a relation rel and returns the inverse relation of the relation rel. The inverse relation InvsetR of the relation R is dened as InvsetR = {(x, y) ∈ S × S |(y, x) ∈ R)}.…
Margarita
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Laravel5.2 withCount not working

I tried to use withCount() method just like the documentation and always i get this error : Call to undefined method Illuminate\Database\Query\Builder::withCount() public function index($id) { $data = \App\Institute::find($id); if(!$data) …
Mahmoud Abd AL Kareem
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In Rails, how do I select only a single object type from a relation query?

How do I select a single entity from a relation? I’m using Rails 4.2.3. I have the below query, which joins on another table, but I only wish to delete one of the objects (the object of type “UserMyObjectTimeMatch”) … …
Dave
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Get the full name from relation in model

I have model Blog and i have relation there: public function getRelUser() { return $this->hasOne(UrUser::className(), ['Id' => 'Rel_User']); } An i want to use fullName in my index of blogView in gridView:
qwerty
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rails has_one through relation does not exist

rails, postgres, devise. There is a side table base with Corporations, to her I was connected successfully. Objective: To create a model User, which will be tied to the corporation, to enable the Corporation to log in as the user. I decided to make…
Marsel.V
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Why my tableView is repeating the last object? PFQuery using pointer

I want to list all favorite ServiceProviders from the current user. Everything is working right except the table view: its duplicating the last object. There is a class Favorite: objectId, User (pointer to User), ServiceProvider (pointer to…
Leo Rochadel
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Parse Pointer or Array?

I have a user table and a location table. A user can visit many locations and locations can be visited by many users. I want to return results, ordered by distance, of the nearest locations that a user has not visited. So many problems arise here.…
RonnyKnoxville
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android many-to-many relations in Parse.com

I'm using parse.com to develop my app. I want to add tagging features for uploaded images. I know I have to use many to many relation, because (one tag) can have many images, and (one image) can have many tags. I read the documentation where they…
Ran
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Yii - validate custom field

I use model which not contain attribute 'countries' because I'm saving it in relations-model via many-to-many relation. When I'm creating form in view I use multiple select for custom field 'countries'. How can I validate it from model on…
Сергей Перенец
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Many to many relationship with Django, Python

Currently i work on an application to manage drivers for cars and events written in Django, Python. I have the two Models: class Vehicle(models.Model): name = models.CharField(max_length=100) max_capacity =…
fechnert
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Symfony2 Many to One relation

Hello Stackoverflow community, I have a question and hope you can help me. I'm new to Symfony2 and try to establish a Many to One relationship. But It doesn't work. At first my two mySQL tables: TABLE user CREATE TABLE IF NOT EXISTS `user` ( `id`…
Marcel
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How change relation between parents and childs in elasticsearch

How change relation between parents and childs in elasticsearch? I could not find information about it. In this question i gave the example of a simple mapping. How i can change street of address? Thanks!
Роман Воробьёв
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Find a NOT-antisymmetric and NOT-transitive relation on the "Real Numbers"

I am searching for a relation on the real numbers. This relation should be NOT antisymmetric and NOT transitive. I found a relation, which is antisymmetric and transitive. ( <= relation) Which relation on the real numbers is NOT antisymmetric and…
basti12354
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How Mysql join query on three tables with multiple colums?

I have three tables like this: Table1 english | hindi -------------- shakti | शक्ति sharma | शर्मा Table2 eng| hin ------------------ Jai |जय Jo | जो **Table3* name | commo| price | ---------------------------------- shakti | jai |…
user3493831
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