I need to request some users by groups list. For this I must use "Member of" function same described here : http://docs.doctrine-project.org/en/2.0.x/reference/dql-doctrine-query-language.html
But in my projet, i prefer use doctrine queryBuilder (documented here : http://docs.doctrine-project.org/en/2.0.x/reference/query-builder.html) but i doesn't found any equivalent in query builder for the "Member of" DQL syntax.
Any idea ?
Unfortunately MEMBER OF, and INSTANCE OF, just got recently added to the Expr* classes, as you can see in this commit:
https://github.com/doctrine/doctrine2/commit/400f420925eea9d50eee9ea3d78a847b381865ce
As far as I know, none of the stable releases include it at the moment, you have to wait for the next release.
Related
I'll simplify things for this scenario (It's in Perfect Developer, it gets complex quite quickly). Let's say I have a simple schema in my class, called Succeed, which takes a Course (which is a previously defined class) as parameter.
Basically, I want to be sure that the course is in my courses set as a precondition, and then add it to my coursesCompleted set in my postcondition. This simple schema works great, and looks like this :
schema !Succeed(c:Course)
pre
c in allCourses
post
coursesCompleted! = coursesCompleted.append(c);
However, I want to add a quite simple if condition: If my coursesCompleted cardinality is 30 or more, I want to set a Diplomation enum to, let's say, "Ok". If the cardinality is less than 30, I will set it to "NotOk"
According to Perfect Developer's documentation, and all the rare examples I've seen, the if syntax should look like this :
if [condition1] : do stuff;
[condition2] : do other stuff;
fi
However, if I plug that directly in my schema, as is :
schema !Succeed(c:Course)
pre
c in allCourses
post
coursesCompleted! = coursesCompleted.append(c),
if [#coursesCompleted >= 30] : diplomation = Ok#DiplomationEnum;
[#coursesCompleted < 30] : diplomation = NotOk#DiplomationEnum;
fi
it does not work, I always end up with a "very descriptive"
Error! Syntax error at keyword 'if', expected one of: '!' '(' '?'
'c_address_of'
I've tried adding some ; everywhere, adding a via keyword after the post, changing it's position, trading ;s with ,, and a lot of other trial and error stuff.
So my question is: How can I add a if condition to a postcondition of a schema, in Perfect Developer?
Please answer in Perfect Developer. I (sadly) know my formal methods, I only need the if to compile in the worst tool in the world.
I can provide a solution in formal-methods using the zet notation, since I am not using Perfect Developer, however, that program should be based on formal-methods. As far as I know in formal methods, if conditions are not used when the system has different behavior over some preconditions, but rather you create 2 methods with different
preconditions(the way i implemented it) or a nested method covering both scenarios, seperated with a Logic OR in between. When it comes to error handling, you first provide a best case scenario and then define a robust method definition(schema calculus).
In formal methods the notation ! is used to describe the output while ? is used for the input.
I hope that this will help you understand possible issues, since its not a direct perfect-developer solution. However, considering the fact that in formal methods mathematics are used, you can use the following specification and jump to any program/language for the implementation part.
Note that: Anything that you will see in the following schemata on the preconditions/how the system changes part, is connected with a logic AND, however I am not using the symbol because is implied as far as a logic OR is not used.
So here is how it will look like in formal-methods(Z-notation).
Whenever a CriteriaQuery in JPA2 does not yield a result, a NoResultException is thrown. This exception is not very useful in the sense that only context-information regarding line numbers where the exception is thrown might give some indication what went wrong.
I would like to have some speaking output "Looking for a class of type and the restrictions applied where and ". It seems, the CriteriaQuery is rather shy on such information, however it seems, with a combination of reflection and getter methods I will eventually get all information I want but it will be quite messy and cumbersome.
Is there a better way to retrieve the data, which went into the CriteriaQuery-Object?
As long as you are sticking to the JPA API, public interface of CriteriaQuery is all you have.
If you are ready to go implementation specific and use Hibernate implementation, there is more available via casting it to org.hibernate.ejb.CriteriaQueryImpl. For example render method seems to provide access to nested class that have getQueryString method.
Most likely some similar ways can be found from other JPA implementations.
I'm using Luabind to bind C++ classes to Lua. From the Lua script, I can add arbitrary properties (key/value pairs) to the tables that represent my classes, even if I never told Luabind these properties exist:
cheese = Cheese()
cheese.type = "gouda"
cheese.age = 2
cheese.hippopotamus = "monkey" -- Oops! This member was not defined!
The hippopotamus line, though nonsensical, will execute without causing a Lua error.
How do I prevent these new properties? I know that when using just the Lua C API this can be accomplished using the __newindex metamethod, but is there a way to do this with Luabind?
I don't speak from experience, but here are some email threads from the luabind-user mailing list: first, a monologue by a guy trying to do exactly what you want. Second, somewhat old (Nov 2009) email from the luabind maintainer, stating that providing custom __newindex metamethod is not currently possible, but planned for 1.0 (current version is 0.9.something).
I am using the Poco generator with EF4 and I am wondering if it is possible to edit the T4 template to force all of my entity classes to implement a custom interface. Since the pocos get blown away and recreated each time the custom tool is run, I would have to add this upon each update - I would sure like to avoid that.
I realize I could create partial classes for each poco and implement the interface there, but I was hoping to avoid all that boilerplate code.
Any suggestions would be welcome.
I think I am getting closer to a solution. I am editing the tt template by adding the implemenatation to the signature that is generated.
<#=Accessibility.ForType(entity)#> <#=code.SpaceAfter(code.AbstractOption(entity))#>partial class <#=code.Escape(entity)#> : IEntity<#=code.StringBefore(" , ", code.Escape(entity.BaseType))#>
But I have hit a bit of a snag. Some of my entities have base classes (table inheritance) that I designated in the edmx design. I have need to force all the entities to implement an interface called IEntity. The IEntity contract has no methods so there really is nothing to implement. I will need to rely on all of the entities having a common base. This is due to a completely separate implementation of a custom validation framework. I am getting the proper signatures for most of the entities, however, the entities that already have a base class are throwing a wobbly because you cant implement an interface before you inherit a base class. :IEntity, BaseClass is not allowed. I need to swap those but am not sure how I would pull that off in the template.
On perusing the code in the CodeGenerationTools class that the T4 template uses (found in the include file EF.Utility.CS.ttinclude), I came across this function StringAfter(string value, string append). Therefore, the answer is quite simple, since you state all your entities have to implement IEntity, the following should do the trick:
<#=Accessibility.ForType(entity)#> <#=code.SpaceAfter(code.AbstractOption(entity))#>partial class <#=code.Escape(entity)#> : <#=code.StringAfter(code.Escape(entity.BaseType), "," )#> IEntity
In fact, I know it does because I've tested it :-)
After the T4 template is added to your application, it becomes part of your app and as any other part of the app, you can do whatever you want with it. If for some reason, you don't want to modify the VS added template, make a copy of it and update this to include only the interface implementation. The second way would produce another set of partial files with the custom interface being implemented.
Dont know if this is near what you need but....
I´ve created a Nuget Package that scaffold tiers from T4-templates.
There are default templates for all interfaces (Repository Pattern and UnitOfWork), but you can edit these templates yourself and re-scaffold your system.
To keep it short.. You just install the package (Install-Package CodePlanner) and then define your domainmodel.. And then run "Scaffold CodePlanner.ScaffoldAll"
Its open source (codeplanner.codeplex.com)
Demo: http://average-uffe.blogspot.com/2011/11/codeplanner-011-released-on-nuget-and.html
Edit: The codeplanner package is built for MVC3!
Regards
Uffe
Continuing from this question, i am confused whether DISPID_VALUE on IDispatch::Invoke() for script functions and properties (JavaScript in my case) can be considered standard and reliable for invoking the actual function that is represented by the IDispatch?
If yes, is that mentioned anywhere in MSDN?
Please note that the question is about if that behaviour can be expected, not what some interfaces i can't know in advance might look like.
A simple use case would be:
// usage in JavaScript
myObject.attachEvent("TestEvent", function() { alert("rhubarb"); });
// handler in ActiveX, MyObject::attachEvent(), C++
incomingDispatch->Invoke(DISPID_VALUE, IID_NULL, LOCALE_SYSTEM_DEFAULT,
DISPATCH_METHOD, par, res, ex, err);
edit: tried to clarify the question.
It should be reliable for invokes on objects from scripts if the script defines it consistently. This should be the case for JScript/Javascript in MSHTML, but unfortunately there is really sparse documentation on the subject, I don't have any solid proof in-hand.
In my own experience, a Javascript function passed to attachEvent() should always be consistent- an object received that is a 'function' can only have one callable method that matches itself. Hence the default method is the only one you can find, with DISPID 0. Javascript functions don't ordinarily have member functions, although i'm sure there is a way for this to be possible. If it did have member functions, you would see them the same way as member functions on objects. Member functions in JScript will always be consistent with regard to IDispatchEx, according to the rules of expando functions, as any functions added to an object count as expandos.
IDispatchEx interface # MSDN
The default method or property that DISPID_VALUE invokes should be consistent for a given interface. That method/property has to be specified as DISPID_VALUE in the definition of the interface in the IDL for the type library. The only way it could change is if the owner of the interface released a new version of the interface that changed which method/property was the default but that would violate a fundamental rule of COM interfaces.
As meklarian said, DISPID_VALUE (0) seems to work pretty consistantly for JS functions (thus it works great with a custom attachEvent). I've been using them this way for about a year, and it's always worked. I've also found with an activeX control embedded with an <object> tag that to get it to work consistently, I need to implement IConnectionPointContainer and IConnectionPoint for the main (object tag) IDispatch-implementing CComObject, but any others that I expose to javascript as return values from methods or properties (through Invoke) I have to implement attachEvent and detachEvent myself.
When using Connection Points, the IDispatch objects in question will expect events to be fired to the same DISPID as they are attached to on your IDispatch object..
see http://code.google.com/p/firebreath/source/browse/src/ActiveXPlugin/JSAPI_IDispatchEx.h for an example of implementing the ConnectionPoints.
You can add DISPID's to a DISPINTERFACE, but you cannot change them once it has been published. If you need to, you can use IDispatch::GetIDsOfNames to map names to DISPIDs.
Pick up a copy of Inside Ole (2nd ed) and Inside Ole 2 (2nd ed) for a few bucks used on Amazon. It's a good reference for these obscure OLE incantations.