How to store a c# List of objects into ElasticSearch with NEST 2.x

Question

I'm developing a cross-platform app with xamarin.forms and I'm trying to look for a way to store a List of Objects directly into ElasticSearch so I can later search for results based on the objects of the lists. My scenario is the folloring:

public class Box {

    [String(Index = FieldIndexOption.NotAnalyzed)]
    public string id { get; set; }

    public List<Category> categories { get; set; }
}


public class Category {

    [String(Index = FieldIndexOption.NotAnalyzed)]
    public string id { get; set; }

    public string name { get; set; }
}

My aim is to be able to search for all the boxes that have a specific category.

I have tried to map everything properly like it says in the documentation but if I do it like that, when I store a box, it only stores the first category.

Is there actually a way to do it or is it just not possible with NEST?

Any tips are very welcome!

Thanks

user405975 · Accepted Answer · 2016-10-08 12:45:46Z

1

It should just work fine with AutoMap using the code in the documentation:

If the index does not exist:

var descriptor = new CreateIndexDescriptor("indexyouwant") .Mappings(ms => ms .Map<Box>(m => m.AutoMap()) );

and then call something like:

await client.CreateIndexAsync(descriptor).ConfigureAwait(false);

or, when not using async:

client.CreateIndex(descriptor);

If the index already exists

Then forget about creating the CreateIndexDescriptor part above and just call:

await client.MapAsync<Box>(m => m.Index("existingindexname").AutoMap()).ConfigureAwait(false);

or, when not using async:

client.Map<Box>(m => m.Index("existingindexname").AutoMap());

Once you succesfully created a mapping for a type, you can index the documents.

Is it possible that you first had just one category in a box and mapped that to the index (Before you made it a List)? Because then you have to manually edit the mapping I guess, for example in Sense.

I don't know if you already have important data in your index but you could also delete the whole index (the mapping will be deleted too) and try it again. But then you'll lose all the documents you already indexed at the whole index.

edited Oct 8, 2016 at 12:45

answered Oct 8, 2016 at 11:59

user405975

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3 Comments

svicente3 Over a year ago

I deleted the index and did all this as the documentation says but, when I tried to store the List it only stored the first object of the list

user405975 Over a year ago

Can you please show how your mapping looks like at the moment and the code where you index a Box?

user405975 Over a year ago

After you've created index with the mapping you should be able to index documents with the following code: client.Index<Box>(refToObj, i => i.Index("index").Type("type").Id("id")); (for example)

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