Questions tagged [concrete-inheritance]
23 questions
0
votes
1 answer
Get an instance to inherit another instance's constraints in pyomo
I'm trying to create an instance that inherits another instance's constraints, whilst adding some new ones.
Is there a way to "copy" the previous instance's constraints into the new one?
Here's a snippet from the code
...
model.bnb_bound_constraints…
Pablo Pablo
- 165
- 10
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1 answer
Create a concrete object in a abstract class by using reflect methods
Suppose I have an abstract class called Model with the following static method:
public abstract class Model {
...
public static List all() {
...
}
...
}
And a concrete class the extends it:
public class Person…
Derick Felix
- 151
- 10
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1 answer
How to model concrete table relationship where a child entity can contain different data, where the data belongs to the same generic type?
I am thinking of using Concrete Table Inheritance for a use case, and need help determining if I need to use identifying vs non-identifying relationship, and also if how to structure my tables exactly.
My use case
I have an HTML form object where…
Dennis
- 7,907
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1 answer
How do I find a list of subclasses for a propel model with concrete inheritance
I'm building a mini-cms for my local charity (yes, I know I could use a floss project, but they want custom coded)
My propel schema currently looks as such:-
…
Mez
- 24,430
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1 answer
Hibernate - table per subclass with unions strategy - id to load is required for loading
I have the following structure:
@Entity
@Inheritance(strategy = InheritanceType.TABLE_PER_CLASS)
public abstract class TemporaryContainerTO {
protected Long temporaryContainerId;
@Id
@GeneratedValue(strategy = GenerationType.TABLE)
…
SG87
- 79
- 12
0
votes
1 answer
Hibernate - Table per concrete class strategy - separate IDs for each table
In my app I have a meeting object with its properties stored in a meeting table.
I have to create a new object, let's say "meetingNEW" having some different properties, but most of them common.
I'm thinking to use the table per concrete class…
SG87
- 79
- 12
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0 answers
What kind of Doctrine inheritance to choose?
I'm having trouble deciding what kind of Doctrine inheritance is right for my project. The goal is for a Virtual Machine (VM) to have multiple softwares (PHP, MySQL and so on ...).Each of these softwares have a distinct class, and some fields in…
Guillaume Fache
- 813
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SQLAlchemy ORM for 12 duplicate tables on each of 6 shard databases
The situation:
I have a set of 12 tables of the same structure (representing data by month) that exist on each of 6 shards across different databases. I need to get a sample set of data across any of these databases for any given set of months.
The…
hello-klol
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