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Questions tagged [relationship]

Questions in this tag typically involve the association that a set of data has with other set(s) of data.

5577 questions
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Laravel "with" changes variable case to snake case

In my Laravel app, I have A model that defines a relationship like: public function vitalCategories() { return $this->belongsToMany( 'App\Models\Diagonals\VitalLabelCategory', 'vitalLabelCategoryMap', 'vitalLabelId', …
Wesley Smith
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UML Class diagram, how to show a Class extends thread?

I have a class called ServerSide in which another class resides called Cserver. The following code fragment should explain what I am talking about: public static void main (String [] args) throws Exception { System.out.println("The server is…
CurryMaster
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SQLAlchemy import tables with relationships

I have problem with separating tables with relationships in different files. I want the tables below to be in three separate files and to import TableA in third party page, but I can not manage the load order. In most of the time I'm receiving the…
bozhidarc
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SQLAlchemy Declarative + relationships across multiple different databases

It took me a while, but I figured out how to use SQLAlchemy to model a relationship across two different kinds of databases: Base = declarative_base() class Survey(Base): __tablename__ = 'SURVEY' survey_id =…
coredumperror
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14
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Room Persistence Deletes Child On Update

I am using Room Library to persist data in my Android App. I have 2 main table, which are Task and Group. The relation is One-to-Many, where a task can belong only to 1 group, but a group can belong to many tasks. The persistence works fine, but the…
Herbert Souza Silva
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1 answer

Many-to-many self-referential relationship in sqlalchemy

I'm trying to make a self-referential many-to-many relationship (it means that Line can have many parent lines and many child lines) in sqlalchemy like this: Base = declarative_base() class Association(Base): __tablename__ = 'association' …
mike
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core data how to filter (NSPredicate) including a relationship requirement and given the relationship object?

How would I filter (construct an NSPredicate) for the following. Have a SCHOOL and PERSON entities One-to-many relationship, i.e. a PERSON has one SCHOOL, SCHOOL has many PERSONs Input to the filter method are (a) persons Name (e.g. all with a…
Greg
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How do I make the parent dirty when I change a hasMany/belongsTo relationship in Ember-Data?

My main problem with Ember Data, right now, is that when I change a relationship (hasMany or belongsTo), the parent doesn't get dirty. I need this because: I'm depending on the isDirty property to show a save/cancel button hasMany and belongsTo ids…
miguelcobain
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MySQL / PHP: Find similar / related items by tag / taxonomy

I have a cities table which looks like this. |id| Name | |1 | Paris | |2 | London | |3 | New York| I have a tags table which looks like this. |id| tag | |1 | Europe | |2 | North America | |3 | River | and a…
Tom
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backbone.js - handling model relationships in a RESTful way

I'm using backbone.js For example, let's suppose we have a "products" model and a "categories" model which have a many-to-many relationship. In one of my views, say I need to retrieve a list of all categories and know whether or not each one is…
Matthew
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Laravel Eloquent - Attach vs. SyncWithoutDetaching

What is the difference between syncWithoutDetaching and attach in Laravel?
Abdulrahman Hashem
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13
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Neo4j - Count distinct nodes

I have this kinds of relationships: (:User)<-[:MENTIONS]-(:Tweet)-[:ABOUT]->(:Topic) I would like to count all the users mentioned in the tweets regarding some topic. With the following query match (n:Topic)<--(t:Tweet)-[:MENTIONS]->(u:User) where…
sirdan
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store many of relation 1:1 between various type of objects : decoupling & high performance

I have 300+ classes. They are related in some ways. For simplicity, all relation are 1:1. Here is a sample diagram. (In real case, there are around 50 relation-pairs.) Note: For some instances, some relation may not exist. For example, some…
javaLover
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Delete a Has-Many Relationship ONLY

I have a: has_and_belongs_to_many :friends, :join_table => "friends_peoples". To add a friend I do: @people.followers << @friend which create the relationship and a new person profile. Now I'd like to delete the relationship ONLY and not the person…
Alextoul
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Getting a list of related models in rails

Suppose I have an object Person, which has_many :foos and :bars. Given an instance, p (p = Person.new), how do I programmatically determine what relationships are available? i.e. p.some_method => ["foo", "bar"]
Paul Schreiber
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