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This is a practical reference example | This is a practical reference example of how to use the ExceutePS function from a ViewModel. There are many possible uses, but this one is fairly descriptive. | ||
Need: Look up all the objects | Need: Look up all the objects with the same value as one particular object. Maybe the user wants to know if something is unique or not… | ||
Model: | Model: | ||
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[[File:Execute -2.png|none|frame|419x419px]] | [[File:Execute -2.png|none|frame|419x419px]] | ||
What happens is that we set the vValueToMatch to the Attribute1 of the ViewModel root Thing. Then, we call the ExecutePS, stating that it will get a result collection with objects of type Thing if it runs the expression found in OutOfLoopToAvoidStdFetch.col1. We collect this result and add the objects to a list we added as a variable – vMyList. | |||
That list can act as root for Grid in the UI. | That list can act as a root for Grid in the UI. | ||
If we have a million Thing | If we have a million Thing objects in the database – this ViewModel will only load the ones with the same attribute1 as the Thing object we started with. | ||
See [[OCLOperators_ExecutePS]] | See: [[OCLOperators_ExecutePS]] | ||
[[Category:OCLPS]] | [[Category:OCLPS]] | ||
[[Category:View Model]] | [[Category:View Model]] | ||
Revision as of 08:01, 21 February 2023
This is a practical reference example of how to use the ExceutePS function from a ViewModel. There are many possible uses, but this one is fairly descriptive.
Need: Look up all the objects with the same value as one particular object. Maybe the user wants to know if something is unique or not…
Model:
ViewModel:
What happens is that we set the vValueToMatch to the Attribute1 of the ViewModel root Thing. Then, we call the ExecutePS, stating that it will get a result collection with objects of type Thing if it runs the expression found in OutOfLoopToAvoidStdFetch.col1. We collect this result and add the objects to a list we added as a variable – vMyList.
That list can act as a root for Grid in the UI.
If we have a million Thing objects in the database – this ViewModel will only load the ones with the same attribute1 as the Thing object we started with.