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POInstance counts from list of text tags
 

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    <p>I am using RavenDB and allowing a user to enter an item into the database with which they can associate textual tags. The class for the item is</p> <pre><code>public class TagItem { public string Id { get; set; } public string UserId { get; set; } public List&lt;string&gt; Tags { get; set;} public DateTime DateCreated { get; set; } } } </code></pre> <p>What i would like to do is get an instance count for each individual tag in a selection of items from the document query. For instance </p> <pre><code>Bacon : 12 Fudge : 8 Marshmallow : 6 </code></pre> <p>I am currently doing this by iterating through the items and incrementing the count for each tag but it doesn't seem to be a very elegant way of obtaining the results. I was wondering if anyone had a suggestion for a better way to achieve this? Thanks in advance.</p> <p>-- EDIT #1 --</p> <p><strong>Matt</strong></p> <p>I have tried to implement your suggestion of faceted search but I cant seem to figure out how to perform a selection using a subset of userIDs. I have created the index as the following</p> <pre><code> public class Tag_Facets : AbstractIndexCreationTask&lt;UserModel&gt; { public Tag_Facets() { Map = locations =&gt; from user in users from tag in user.Tags select new { Tag = tag.ToString().ToLower(), user.Id }; } } </code></pre> <p>I have a List of UserIds that I would like to use to narrow this selection down before running the facet against it but none of the methods that I have tried want to compile. Can you provide me with an idea of what the Where clause would look like for this?</p> <p>My FacetSetup is as follows</p> <pre><code>this.DocumentSession.Store(new FacetSetup { Id = "facets/TagFacets", Facets = new List&lt;Facet&gt; { new Facet { Name = "Tag" } } }); </code></pre> <p>The query that i am trying to build is </p> <pre><code>var facetResults = this.DocumentSession.Query&lt;LocationModel&gt;("Tag/Facets") .Where(x =&gt; x.Id.Contains(new List&lt;string&gt; { "1", "2", "3" })) .ToFacets("facets/TagFacets"); </code></pre> <p>which will not build because Contains doesn't accept List</p> <p>I was hoping that you might be able to point me in the right direction on how I might accomplish this.</p> <p>Also, thank you for your work on Faceted Search. It seems to be what I'm looking for to perform a lot of the queries that I need to run in RavenDB. Cheers!</p> <p>-- EDIT #2 --</p> <p>This is the SQL expression that I would use to achieve the results that I wanted.</p> <pre><code>SELECT t.Tag, COUNT(*) FROM UserTags t WHERE t.UserID in ('1', '2', '3', '4', '5') GROUP BY t.Tag </code></pre>
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    1. COI should add, that my current method of performing this is to limit the TagItems to a List<TagItem> by a group of UserId's then iterating through them to achieve the count. Therefore, it is not a total count of the items with a specific tag, but a total of the selected subset.
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