Lowercase property names from .NET using NEST

Elastic Stack Elasticsearch
#1

Hello,

I'm VERY new to ES and I mainly use C# so I downloaded the NEST .net API.
I indexed an object (named "Nation" -> ES type "Nations") which has the
following properties for example: Name, ISO.
When I look at the _source in ES I see it turned all my properties to
lowercase: name. iSO.
So I read a bit on NEST and saw they have an attribute for the property:

  • [ElasticProperty(Name = "Name")]
    public stirng Name { get; set; }
  • [ElasticProperty(Name = "ISO")]
    public stirng ISO { get; set; }
    But this is annoying since it's on the prop level, so I have to set it for
    all the hundreds of props I have in the project.

Isn't there an easier way to tel ES to stop lower-casing my fields?

Thanks.
Liron

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#2

Hi Liron,

Nests default behavior is to camelCase all the property names, you can
easily override this globally by setting a custom TypeNameInferrer method.

var uri = new Uri("http://localhost:9200");
var settings = new ConnectionSettings(uri)
.SetDefaultIndex("mydefaultindex")
.SetTypeNameInferrer(i=>i);
var client = new ElasticClient(settings);

This leaves the original propertynames untouched. Be aware though that an
explicit ElasticProperty Annotation always takes precedence so remove the
annotations.

See also: http://nest.azurewebsites.net/concepts/connecting.html

On Thursday, August 22, 2013 1:26:55 PM UTC+2, Liron Cohen wrote:

Hello,

I'm VERY new to ES and I mainly use C# so I downloaded the NEST .net API.
I indexed an object (named "Nation" -> ES type "Nations") which has the
following properties for example: Name, ISO.
When I look at the _source in ES I see it turned all my properties to
lowercase: name. iSO.
So I read a bit on NEST and saw they have an attribute for the property:

  • [ElasticProperty(Name = "Name")]
    public stirng Name { get; set; }
  • [ElasticProperty(Name = "ISO")]
    public stirng ISO { get; set; }
    But this is annoying since it's on the prop level, so I have to set it
    for all the hundreds of props I have in the project.

Isn't there an easier way to tel ES to stop lower-casing my fields?

Thanks.
Liron

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#3

Thanks. But I meant the properties' names. no the object (/type) name.
The correct syntax is:
.SetDefaultTypeNameInferrer(p => p.Name);
So .net' Location object turn into Location Type in ES.

Any thought as to how to make something similar for properties?

Thanks again,
Liron

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#4

Argh, serves me right for writing code from the top of my head before the
first cuppa.

See: https://github.com/Mpdreamz/NEST/issues/275

I'll be sure to improve the API for this in the next version!

On Fri, Aug 23, 2013 at 3:47 PM, Liron Cohen cliron1@gmail.com wrote:

Thanks. But I meant the properties' names. no the object (/type) name.
The correct syntax is:
.SetDefaultTypeNameInferrer(p => p.Name);
So .net' Location object turn into Location Type in ES.

Any thought as to how to make something similar for properties?

Thanks again,
Liron

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#5

Ohh... You're a life saver.
I almost gave up on this...
Perfect.

So just to keep it all in this thread, here is the final solution:
var settings = new ConnectionSettings(new Uri("localhost/9200"));
settings
.SetDefaultTypeNameInferrer(p => p.Name);
var client = new ElasticClient(settings);
client.ModifyJsonSerializationSettings(s =>
s.ContractResolver = new Nest.Resolvers.ElasticResolver(settings);
);

Thanks.

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#6