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 12:30:35 -0400
Message-ID: <CAJCJWG05cyxM4tVcSuWdKvWc-Li7DN6CwTFaDB7pFiqN3VS...@mail.gmail.com>
Subject: Re: [mongodb-user] BsonClassMap support for DLR
From: Robert Stam <rob...@10gen.com>
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There are no immediate plans to extend how BsonClassMaps work. Perhaps for
a future version.

As far as not wanting to create a dependency on the C# driver in your data
model classes, the feature to store extra elements in a field of your class
has been extended so that the field that holds the extra elements no longer
has to be a BsonDocument. You can now also choose for the extra elements
field to be of type IDictionary<string, object> which doesn't require a
dependency on the C# driver. See:

https://jira.mongodb.org/browse/CSHARP-395

If you wrote your DLR accessor methods to save and retrieve your extra
values from this IDictionary<string, object> that might work for you. It
would require that you use strings as keys and that they be valid when used
as BSON element names.

On Sat, Mar 17, 2012 at 12:09 PM, DaveC <dacur...@gmail.com> wrote:

> 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?
>>>
>>> --
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>>>
>>
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There are no immediate plans to extend how BsonClassMaps work. Perhaps for =
a future version.<div><br></div><div>As far as not wanting to create a depe=
ndency on the C# driver in your data model classes, the feature to store ex=
tra elements in a field of your class has been extended so that the field t=
hat holds the extra elements no longer has to be a BsonDocument. You can no=
w also choose for the extra elements field to be of type IDictionary&lt;str=
ing, object&gt; which doesn&#39;t require a dependency on the C# driver. Se=
e:</div>
<div><br></div><div><a href=3D"https://jira.mongodb.org/browse/CSHARP-395">=
https://jira.mongodb.org/browse/CSHARP-395</a>=A0<br></div><div><br></div><=
div>If you wrote your DLR accessor methods to save and retrieve your extra =
values from this IDictionary&lt;string, object&gt; that might work for you.=
 It would require that you use strings as keys and that they be valid when =
used as BSON element names.<br>
<br><div class=3D"gmail_quote">On Sat, Mar 17, 2012 at 12:09 PM, DaveC <spa=
n dir=3D"ltr">&lt;<a href=3D"mailto:dacur...@gmail.com">dacur...@gmail.com<=
/a>&gt;</span> wrote:<br><blockquote class=3D"gmail_quote" style=3D"margin:=
0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
I wouldn&#39;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:<div><br>=
</div><div>BsonClassMap.RegisterClassMap&lt;T&gt;(cm=3D&gt;cm.GetExtraPrope=
rties(someMethod))</div>
<div><br></div><div>where someMethod() will be called when serializing in o=
rder to retrieve any extra properties that aren&#39;t in the object.</div><=
div><br></div><div>And for extra properties in the BSON document that don&#=
39;t have a class map, instead of having to put a BsonDocument with the Bso=
nExtraElements attribute, have another method for those:</div>
<div><br></div><div>BsonClassMap.RegisterClassMap&lt;T&gt;(cm=3D&gt;cm.SetE=
xtraProperties(someMethod))</div><div><br></div><div>where someMethod(BsonV=
alue) is called, and we can do the work of converting to the appropriate ty=
pe. =A0A BsonExtraElements member sort of works for this, but that means yo=
u need to put a BsonDocument into your class, which means anything that use=
s your class will need a reference to MongoDB BSON code.</div>
<div><br></div><div>Would that be possible in the C# driver? =A0Is this the=
 right way to request this type of feature?</div><div><div class=3D"im"><br=
>On Thursday, March 15, 2012 1:30:18 PM UTC-4, Robert Stam wrote:</div><blo=
ckquote class=3D"gmail_quote" style=3D"margin:0;margin-left:0.8ex;border-le=
ft:1px #ccc solid;padding-left:1ex">
<div class=3D"im">The current version of the C# driver only requires .NET F=
ramework 3.5.<div><br></div><div>We have not yet determined at what point w=
e will raise the minimum requirement to .NET Framework 4, so .NET Framework=
 4 only features are on hold until then.</div>

</div><div><br><div class=3D"gmail_quote">On Mon, Mar 12, 2012 at 6:01 PM, =
DaveC=A0wrote:<div class=3D"im"><br><blockquote class=3D"gmail_quote" style=
=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
I&#39;ve got several classes that implement the DLR&#39;s System.Dynamic.<u=
></u>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&#39;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&#39;t just serializ=
e the object with the dictionary because the keys are meaningless hashes ra=
ther than useful property names. Is there anything on BsonClassMap that cou=
ld get additional class members by calling my own custom logic (which would=
 get items from this hashed dictionary)? BsonClassMap.<u></u>SetExtraElemen=
tsMember seems like the right idea, but doesn&#39;t quite do it since it&#3=
9;s just looking for a compile time class member. If not, are there any pla=
ns for supporting DLR types directly?

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

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</font></span></blockquote></div></div><br></div>
</blockquote></div><div class=3D"im">

<p></p>

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ss=3D"h5">
<br>=20
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</div></div></blockquote></div><br></div>

<p></p>

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