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Re: problem with Entities and inherance
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Re: problem with Entities and inherance

  • Subject: Re: problem with Entities and inherance
  • From: Chuck Hill <email@hidden>
  • Date: Fri, 24 Apr 2015 16:31:29 +0000
  • Thread-topic: problem with Entities and inherance
Single Table is usually the best choice.

On 2015-04-24, 9:30 AM, "HOUNKPONOU Ronald" wrote:

Hi Chuck,
I am using horizontal inheritance. 

I've choose it after i read  the section on inheritance in Practical WebObjects.
But i read it again may be i miss something

2015-04-24 17:26 GMT+01:00 Chuck Hill <email@hidden>:
It sounds like you used Vertical Inheritance.  I generally don’t recommend it.  One reason is that you can’t enforce foreign key constraints like this.  I suggest reading the section on inheritance in Practical WebObjects

Chuck


On 2015-04-24, 9:22 AM, "HOUNKPONOU Ronald" wrote:

Hi,
have a problem with Entities and inherance.
I have 3 Entities AbstractPerson, Person and Account.

AbstractPerson is abstract.

Person inherit from AbstractPerson.
An AbstractPerson can have many Accounts.
I can esaly create a Person.
The problem is that when I try to insert an Account that belongs to a Person, i got this ERROR :

ERROR: an  insert or update instruction on the « Account » violate the foreign key constraint « account_abstractperson_fk »
Details: The key (abstractpersonid)=(1) is not present in the table « abstractperson ».

 
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References: 
 >problem with Entities and inherance (From: HOUNKPONOU Ronald <email@hidden>)
 >Re: problem with Entities and inherance (From: Chuck Hill <email@hidden>)
 >Re: problem with Entities and inherance (From: HOUNKPONOU Ronald <email@hidden>)

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