Documentation:Breaking changes

2021-Feb, Issue with ViewModelActions

It was allowed to have self in ViewModelContextActions - but self is undefined and you are supposed to use vCurrent_ (class actions has self - ViewModelActions does not)

Sometimes it worked anyway - but often it led to strange errors and view that did not show.

After this change you may get a lot of Model errors.

The fix is to replace "self" with "vCurrent_<TheViewOwningTheAction>".

For the simple cases this in the Designer debugger may help:

MDriven Framework : we now require legal ocl in all oclColumns

Starting from 2018 and the support for VS2019 we made changes related to efficient load that make the framework check all oclColumns.

Prior to this point oclColumns could be ignored if no-one ever used them - but now - we assume that they are all used and thus valid. This is inline with our shift from placed handles to compound declarative ViewModels that are statically checked along with the model.

We will now throw exception if a n illegal ocl is found in the derivation phase.

If you would rather just log this with trace you can do so by setting the new variable:

/// <summary>
/// Set this property to false (default true) if you only want trace logging of failing derivations
/// </summary>
AbstractDeriver.ThrowExceptionOnFailedDerivation=false

MDriven Framework : VariableHandle changed default on AddDefaultNestings and AddDefaultProperties from true to false

Earlier we had AddDefaultNestings and AddDefaultProperties=true as default and this was introducing extra load that was not necessarily asked for. If you want to use "self" a better option is to set AddSelfColumn on the variableHandle