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The idea behind "derived" pragma

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Uko2

The idea behind "derived" pragma

Hi everyone!

I have a question about a <derived> pragma.

As stated on
http://code.google.com/p/moose-technology/wiki/FameMetaDescriptions :
<derived> the property value can be derived from other properties (no need
for persistence).

So I have a question: why are for example localVariables and parameters of a
FAMIXBehaviouralEntity derived when they are stored in the instance
variable?

Regards
Yuriy

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Andre Hora

Re: The idea behind "derived" pragma

On Mon, Feb 4, 2013 at 10:48 AM, Yuriy Tymchuk <[hidden email]> wrote:

Hi everyone!

I have a question about a <derived> pragma.

As stated on
http://code.google.com/p/moose-technology/wiki/FameMetaDescriptions :
<derived> the property value can be derived from other properties (no need
for persistence).

So I have a question: why are for example localVariables and parameters of a
FAMIXBehaviouralEntity derived when they are stored in the instance
variable?

You don't need to store, because they can be computed from other properties. But when storing you have faster queries.

Moreover, you don't need to have such derived properties in the MSE file because they can be always derived from others.

Regards
Yuriy

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Andre Hora

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Uko2

Re: The idea behind "derived" pragma

Ok, so it's mainly for serialization purposes I guess.

This makes sense. And this way in many-to-one relationships one part will be always derived.

On 4 лют. 2013, at 11:23, "Andre Hora [via moose-dev]" <[hidden email]> wrote:

On Mon, Feb 4, 2013 at 10:48 AM, Yuriy Tymchuk <<a href="x-msg://2561/user/SendEmail.jtp?type=node&node=4026064&i=0" target="_top" rel="nofollow" link="external">[hidden email]> wrote:
Hi everyone!

I have a question about a <derived> pragma.

As stated on
http://code.google.com/p/moose-technology/wiki/FameMetaDescriptions :
<derived> the property value can be derived from other properties (no need
for persistence).

So I have a question: why are for example localVariables and parameters of a
FAMIXBehaviouralEntity derived when they are stored in the instance
variable?

You don't need to store, because they can be computed from other properties. But when storing you have faster queries.

Moreover, you don't need to have such derived properties in the MSE file because they can be always derived from others.

Regards
Yuriy

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