BsonClassMap support for DLR - NoSQL Databases

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Message from discussion BsonClassMap support for DLR
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Date: Sat, 17 Mar 2012 09:09:38 -0700 (PDT)
From: DaveC <dacur...@gmail.com>
To: mongodb-user@googlegroups.com
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Subject: Re: [mongodb-user] BsonClassMap support for DLR
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I wouldn't want to require a minimum of .NET 4, but a way to hook into my 
DLR property backing collection would be great. Something like:

BsonClassMap.RegisterClassMap<T>(cm=>cm.GetExtraProperties(someMethod))

where someMethod() will be called when serializing in order to retrieve any 
extra properties that aren't in the object.

And for extra properties in the BSON document that don't have a class map, 
instead of having to put a BsonDocument with the BsonExtraElements 
attribute, have another method for those:

BsonClassMap.RegisterClassMap<T>(cm=>cm.SetExtraProperties(someMethod))

where someMethod(BsonValue) is called, and we can do the work of converting 
to the appropriate type.  A BsonExtraElements member sort of works for 
this, but that means you need to put a BsonDocument into your class, which 
means anything that uses your class will need a reference to MongoDB BSON 
code.

Would that be possible in the C# driver?  Is this the right way to request 
this type of feature?

On Thursday, March 15, 2012 1:30:18 PM UTC-4, Robert Stam wrote:
>
> The current version of the C# driver only requires .NET Framework 3.5.
>
> We have not yet determined at what point we will raise the minimum 
> requirement to .NET Framework 4, so .NET Framework 4 only features are on 
> hold until then.
>
> On Mon, Mar 12, 2012 at 6:01 PM, DaveC wrote:
>
>> I've got several classes that implement the DLR's 
>> System.Dynamic.IDynamicMetaObject interface in order to allow additional 
>> fields added to C# types at runtime. To serialize these dynamically added 
>> fields to the BSON document, I'm forced to use a custom serializer (lots of 
>> work to implement). It would be much simpler if BsonClassMap provided a way 
>> to get these fields that are added at runtime. For example, all my dynamic 
>> fields are stored in a dictionary keyed by hashed names. I can't just 
>> serialize the object with the dictionary because the keys are meaningless 
>> hashes rather than useful property names. Is there anything on BsonClassMap 
>> that could get additional class members by calling my own custom logic 
>> (which would get items from this hashed dictionary)? 
>> BsonClassMap.SetExtraElementsMember seems like the right idea, but doesn't 
>> quite do it since it's just looking for a compile time class member. If 
>> not, are there any plans for supporting DLR types directly? 
>>
>> -- 
>> You received this message because you are subscribed to the Google Groups 
>> "mongodb-user" group.
>> To view this discussion on the web visit 
>> https://groups.google.com/d/msg/mongodb-user/-/7Hkyz4EfbHQJ.
>> To post to this group, send email to mongodb-user@googlegroups.com.
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>>
>
>

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I wouldn't want to require a minimum of .NET 4, but a way to hook into my D=
LR property backing collection would be great. Something like:<div><br></di=
v><div>BsonClassMap.RegisterClassMap&lt;T&gt;(cm=3D&gt;cm.GetExtraPropertie=
s(someMethod))</div><div><br></div><div>where someMethod() will be called w=
hen serializing in order to retrieve any extra properties that aren't in th=
e object.</div><div><br></div><div>And for extra properties in the BSON doc=
ument that don't have a class map, instead of having to put a BsonDocument =
with the BsonExtraElements attribute, have another method for those:</div><=
div><br></div><div>BsonClassMap.RegisterClassMap&lt;T&gt;(cm=3D&gt;cm.SetEx=
traProperties(someMethod))</div><div><br></div><div>where someMethod(BsonVa=
lue) is called, and we can do the work of converting to the appropriate typ=
e. &nbsp;A BsonExtraElements member sort of works for this, but that means =
you need to put a BsonDocument into your class, which means anything that u=
ses your class will need a reference to MongoDB BSON code.</div><div><br></=
div><div>Would that be possible in the C# driver? &nbsp;Is this the right w=
ay to request this type of feature?</div><div><br>On Thursday, March 15, 20=
12 1:30:18 PM UTC-4, Robert Stam wrote:<blockquote class=3D"gmail_quote" st=
yle=3D"margin: 0;margin-left: 0.8ex;border-left: 1px #ccc solid;padding-lef=
t: 1ex;">The current version of the C# driver only requires .NET Framework =
3.5.<div><br></div><div>We have not yet determined at what point we will ra=
ise the minimum requirement to .NET Framework 4, so .NET Framework 4 only f=
eatures are on hold until then.</div>
<div><br><div class=3D"gmail_quote">On Mon, Mar 12, 2012 at 6:01 PM, DaveC&=
nbsp;wrote:<br><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex=
;border-left:1px #ccc solid;padding-left:1ex">
I've got several classes that implement the DLR's System.Dynamic.<wbr>IDyna=
micMetaObject interface in order to allow additional fields added to C# typ=
es at runtime. To serialize these dynamically added fields to the BSON docu=
ment, I'm forced to use a custom serializer (lots of work to implement). It=
 would be much simpler if BsonClassMap provided a way to get these fields t=
hat are added at runtime. For example, all my dynamic fields are stored in =
a dictionary keyed by hashed names. I can't just serialize the object with =
the dictionary because the keys are meaningless hashes rather than useful p=
roperty names. Is there anything on BsonClassMap that could get additional =
class members by calling my own custom logic (which would get items from th=
is hashed dictionary)? BsonClassMap.<wbr>SetExtraElementsMember seems like =
the right idea, but doesn't quite do it since it's just looking for a compi=
le time class member. If not, are there any plans for supporting DLR types =
directly?

<span><font color=3D"#888888"><p></p>

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</font></span></blockquote></div><br></div>
</blockquote></div>

<p></p>

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