Patch Requests in Raven 4 Some examples needed please.

[Ian Davies]

Hi Guys

Migrating our DB layer to Raven4 and having some problems around patching 

I have looked at the book and its not very clear how I would do these kind of patches

  patchRequests.Add(new PatchRequest

            {

                Type = PatchCommandType.Add,Set,UnSet,Insert etc...

                Name = propertyName;

                Value = ***

            });

I currently also have these as deferred patches and without the entity loaded for efficiency. 

In the book i found this example 

 session.Advanced.Patch(call, c => c.Comments, 
  	comments => comments.Add("This is important stuff!"));

I could find overloads for setting a value on a property without loading the entity and just the ID passed in but nothing for Add, Insert or Unset. Anything deferred seems to have to be a manually crafted JavaScript patch or am i missing something ? 

We have quite a lot of dictionaries on our entities so we use Unset quite a lot when removing values via a patch

Thanks in Advance

[Oren Eini (Ayende Rahien)]

Yes, the idea is that you can either use `session.Advanced.Patch`  to do the common operations or use JS code to directly modify the document. 

You can do something like this:

"delete this['FIELD_TO_DELETE']'

Or even pass this as an argument.

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[Ian Davies]

Ho Oren,

So I can do things like this

Session.Advanced.Defer(new PatchRequest

  {

     Script = $"delete this.{fieldName}" // Unset equivalent // Or
     Script =  $"this.{fieldName} = {value}" // Set  equivalent // Or
     Script =  $"insert(this.{fieldName}, {value})" // Insert  equivalent // Or 
 Script =  $"add(this.{fieldName}, {value})" // Insert  equivalent // Or 

[Ian Davies]

Where can I find a reference for the commands and commands available like 'delete' ?

[Oren Eini (Ayende Rahien)]

Yes

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Oren Eini l CEO l Mobile: + 972-52-548-6969

Office: +972-4-622-7811 l Fax: +972-153-4-622-7811

 

[Oren Eini (Ayende Rahien)]

This is just javascript code running on the document in question (which is the this instance)

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Oren Eini l CEO l Mobile: + 972-52-548-6969

Office: +972-4-622-7811 l Fax: +972-153-4-622-7811

 

[Ian Davies]

@Oren,

Ok, Sorry, started to get the hang of this the 'delete' confused me, I didn't know this was a built in JavaScript function / keyword.

But I'm still having some problems.

It's not clear what types of values can go into the values dictionary and will Raven automatically enclose strings , and convert dates to ISO etc ? . I have looked at your tests and these just seem to be any .net types. But i'm putting complex types into here and they are not getting set correctly in Raven I just seem to get a load of arrays (See last modified in the attachment) this is a complex type with a userid, username and date time stamp.

   

  var script = $"this.{propertyName} = args.data.item";

     patchRequests.Add(

            new PatchRequest

            {

                Script = script,

                Values =  {

                            { "data", new {item = value} } // Note : value could be complex type

                        } 

            });

Also Ideally I really need my complex types serialized using my custom contract resolver. I have certain kinds of properties that I don't want in the DB.

This was easy when it was a jObject that I could pass through on the patch request, now it seems I will have to serialize using my resolver and deserialise to something else ? dynamic ? this does not seem the way to go.

Or I just build the script and serialise my objects manually and I will have to deal with enclosures manually based on the types manually also.

It's doable of course , but what i'm getting at is that this is now a harder development experience in my opinion.

Thanks

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[Grisha Kotler]

You can use the new patching API.

See here:

https://github.com/ravendb/ravendb/blob/v4.0/test/FastTests/Client/FirstClassPatch.cs#L128

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Office: +972-4-622-7811 l Fax: +972-153-4-622-7811

RavenDB paving the way to "Data Made Simple" http://ravendb.net/

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[Oren Eini (Ayende Rahien)]

Did you attach anything here, I'm not seeing it.

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