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Questions tagged [self-reference]

Self-reference is the ability of a program (or logical sentence) to refer to itself, either directly or indirectly.

Self-reference is the ability of a program (or logical sentence) to refer to itself, either directly or indirectly.

Useful Links:

Stanford Encyclopedia 'Self Reference' Entry

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596 questions
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Returning source objects in self-referencing has_many, :through

Here's my User model: class User < ActiveRecord::Base has_many :friends, :class_name => 'Friendship', :dependent => :destroy end Here's my Friendship model: class Friendship < ActiveRecord::Base belongs_to :user belongs_to :friend,…
keruilin
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spark recursively fix circular references in class

My initial data structure contains self-references which are not supported by spark: initial.toDF java.lang.UnsupportedOperationException: cannot have circular references in class, but got the circular reference The initial data structure: case…
Georg Heiler
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Getting hierarchical data from self referencing table in SQL 2005

I am using SQL 2005, with existing data of millions of records (so data structure can not be changed) and I'm trying to do the following: I have some data (following example is from another question and modified a bit to show what I am trying to…
Jay
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SQLAlchemy Self Referencing Relationship - NoReferencedTableError

I'm using SA 0.6.6, Declarative style, against Postgres 8.3, to map Python objects to a database. I have a table that is self referencing and I'm trying to make a relationship property for it's children. No matter what I try, I end up with a…
Corey Coogan
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C++; using lambdas to conditionally expand a function within a class (seg fault with MWE)

I would like to use lambdas to conditionally expand the functionality of a function within a class. There is no problem doing this outside of the class scope (see example), but the minimal working example below leads to a segmentation fault when…
user2712187
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Delete cascade foreign key constraint error with SQLAlchemy

I slightly modified the official example for a directed graph and added a cascade='all, delete-orphan as recommended for cascading deletion if the relationship is defined in the child. Still, when I try to delete a parent I get a foreign key…
wackazong
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Self reference table to a recursive list\collection

I currently have data in a SQL table that contains a ConfigHead table and a Config Line Table. The Config Line table is a self referencing table. My new data structure has the ConfigLines that has a collection of ConfigLines, i am trying to…
user2859298
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Core Data: Self referencing table

I have an Entity in my Core Data model that contains a reference to itself. i.e. A Page can have a child collection of pages. When compiling i get the warning: "Page.pages -- to-many relationship does not have an inverse: this is an advanced…
Aran Mulholland
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Type aliasing and self-referencing

As an example, a singly-linked list node might be defined as follows namespace example_part1 { class node { node * next; int value; } } assuming we have a list of integers only. This class is allowed to have a member…
Konrad
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What is the proper way to define self-referencing interface?

I'm sorry if this question has been asked before, I tried hard to find something like it, but I wasn't even sure what to search for. Suppose I have following interface (this is just an example, my specific case have nothing to do with operators or…
Reverent Lapwing
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aspnet core entity framework 7 self referencing "job" 1 to many table

I have a "Job" table that contains jobs. The fact is Jobs are not always done in one go.. you can have a job that has many visits. I intended to represent that as another job but linked back to the original job via self referencing linkId. I am…
si2030
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Entity Framework Self-Referencial Many-To-Many with Payload ( Bill of Materials BOM )

I asked this question a while back without an answer, I believe it may be the most bizarre implementation for the EF, although it is quite practical. Here is my previous post: Entity Framework Self Referencing Hierarchical Many To Many I've decided…
aframeb
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Updating a MySQL table with a self-referencing column

I have a table (simplified) that looks like this: id | name | selfreference | selfreference-name ------ | -------| --------------| ------------------ 1 | Vienna | | 2 | Wien | | Vienna 3 | Виена …
Tench
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Bidirectional self-referencing mapping with additional fields in doctrine 2

I'm stuck on this. Here is what i got: I got a DocumentEntitiy which is able to have $previosDocuments and $nextDocuments.This relation is bidirectional and both of them are ArrayCollections. But I also need to know some other additional…
Kami Yang
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SQLAlchemy self-referential many to many with extra association data

I have the following basic SQLAlchemy model with a many to many self reference: class Organisation(Base): __tablename__ = 'organisation' name = Column(String(50)) url = Column(String(128)) associated = relationship( …
user162390
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