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==== NOTE: ExcutePS is replaced with selfVM.[[OCLOperators PSEval|PSEval]] - use that instead for new stuff ==== | |||
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. | 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… | '''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: | The Model: | ||
[[File:Execute -1.png|none|frame|283x283px]] | [[File:Execute -1.png|none|frame|283x283px]] | ||
ViewModel: | The ViewModel: | ||
[[File:Execute -2.png|none|frame|419x419px]] | [[File:Execute -2.png|none|frame|419x419px]] | ||
Set the vValueToMatch to the Attribute1 of the ViewModel root Thing. Then, call the ExecutePS, stating that it will get a result collection with the objects of type Thing if it runs the expression found in OutOfLoopToAvoidStdFetch.col1. Collect this result and add the objects to a list you added as a variable – vMyList. | |||
The list can act as a root for Grid in the UI. | The list can act as a root for Grid in the UI. | ||
If | If you have a million Thing objects in the database, this ViewModel will only load the ones with the same attribute1 as the Thing object you started with. | ||
See: [[OCLOperators_ExecutePS]] | See: [[OCLOperators_ExecutePS]] | ||
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[[Category:View Model]] | [[Category:View Model]] | ||
[[Category:OCL ViewModel Operators]] | [[Category:OCL ViewModel Operators]] | ||
{{Edited|July|12|2024}} | |||
Latest revision as of 15:35, 10 February 2024
NOTE: ExcutePS is replaced with selfVM.PSEval - use that instead for new stuff
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…
The Model:
The ViewModel:
Set the vValueToMatch to the Attribute1 of the ViewModel root Thing. Then, call the ExecutePS, stating that it will get a result collection with the objects of type Thing if it runs the expression found in OutOfLoopToAvoidStdFetch.col1. Collect this result and add the objects to a list you added as a variable – vMyList.
The list can act as a root for Grid in the UI.
If you have a million Thing objects in the database, this ViewModel will only load the ones with the same attribute1 as the Thing object you started with.