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Instances of type 'InitialQueryParameter' cannot be added to a container

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Posted on by jameszhang

Like that,I wanna add a query into container, but throw this error!

Is there someone who knows what the problem is?

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Martin Dráb 237,976 Most Valuable Professional on at

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You can't meaningfully pack object refences - they're just addresses in memory and they would be useless when you try to unpack the container. You need to pack the object itself to a container.

The Query class has pack() method for this purpose.

In unpack(), you'll pass the packed query to Query's constructor.

By the way, if it's a new class that you're developing, thing again if this is the best possible design. Wouldn't it be much easier if you used the SysOperation framework, created a data contract class instead of such a macro and avoid implementing of pack() and unpack() methods by yourself?

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jameszhang on at

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Thanks for your suggestions. This is a platform issue where form opening from a workspace tile is not taking into consideration the query from the menu item. I'm trying to add initialQuery into container since Args.pack() doesn't support the initialQuery, if we don't add query to container instead shell we add query when create Args?

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Martin Dráb 237,976 Most Valuable Professional on at

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I'm sorry, but I don't understand what you mean by "Args.pack() doesn't support the initialQuery", I don't know from which class was the code you showed before and I also don't know where the create() method (from your last screenshot) is defined. Could you give us some context for your questions, please?

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jameszhang on at

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The code I showed all came from Args.xpp, which is used to pass arguments such as a name, a caller, and parameters. Forms, reports and queries all use this class as their first argument in the constructor.

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Martin Dráb 237,976 Most Valuable Professional on at

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It seems to me that the bug is in your code and not in Args class. You said that you're trying to add initialQuery into container, and that the part that doesn't work, for reasons that I explained above. Did you understand my explanation? If so, you know the cause and should have some idea about how to fix it.

Thing carefully whether extending Args is safe enough, because it's used at a huge amount of places. If you think it is, you need to extend pack() and unpack(), as discussed in my first reply.

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jameszhang on at

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I understood what you said, but I don't know how to make class InitialQuery be packable and unpackable since it cause the problem that I can not add it to container.

Could you give me some suggestions, please?

Thanks for help again, btw.

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Martin Dráb 237,976 Most Valuable Professional on at

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Sorry, I didn't realize that we aren't talking about the Query class.

It'll be slightly more work, but it's nothing impossible.

First of all, decide which properties of InitialQueryParameter you need to support. I'll assume that you want just the query.

In that case, you need to get a query from InitialQueryParameter and call its pack() method. That's easy:

container packedQuery = initialQuery().query().pack();

When unpacking the object, you need to create an InitialQueryParameter instance from the packed query. That's not difficult either:

initialQuery = InitialQueryParameter::createByQuery(newQuery(packedQuery));

Note that you can use SysPackExtensions class to add your values to the standard contain in an extension of pack(), and extract your packed values in unpack().

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jameszhang on at

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I got confused about what you mentioned, I know Args.pack doesn't support packing the initialQuery. To make this work we would need to add this to pack, unpack, and copyFrom. The InitialQueryParameter.cpp class would also need to be made packable/unpackable. But I don't know how to add container to .cpp？I‘m not familiar with that, could you give me some more details about these? Thanks a lot!

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Martin Dráb 237,976 Most Valuable Professional on at

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You're wrong in thinking that "InitialQueryParameter class would also need to be made packable" - my solution above doesn't need that. It implements it in an extension of Args class.

You can add packing methods to InitialQueryParameter class, but you can't change code of kernel F&O class (nor any other standard class). You would need an extension.

If you're not familiar with extensions and you're trying to change standard classes, please stop immediately, because you'll never be able to deploy such a solution. Instead, please read about Class extension model in X++.

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jameszhang on at

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if I have to use macro structure to pack the InitialQuey, how to add the query in there? That troubles me a lot why I can not just pack the instance of InitialQuery .

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