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Message from discussion Struggling with complex index
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Oren Eini (Ayende Rahien)  
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 More options May 11 2012, 5:53 am
From: "Oren Eini (Ayende Rahien)" <aye...@ayende.com>
Date: Fri, 11 May 2012 10:53:56 +0100
Local: Fri, May 11 2012 5:53 am
Subject: Re: [RavenDB] Struggling with complex index
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Oh, I see, I was confused because I thought CandidateId and ClientId where
the same.

AddMap<VacancyApplication>(applications => from a in applications
                                           select new
                                           {
                                               VacancyId = a.VacancyId,
                                               CandidateIds = new[]
{a.CandidateId},
                                               ClientId = (string)null,
                                           });

AddMap<Vacancy>(vacancies => from v in vacancies
                             select new
                             {
                                 VacancyId = v.Id,
                                 CandidateIds = new string[0],
                                 ClientId = v.ClientId,

                             });

Reduce = results => from result in results
                    group result by result.VacancyId into g
                    select new
                    {
                      VacancyId = g.Key,
                      CandidateIds = g.SelectMany(x=>x.CandidateIds),
                      ClientId = g.Select(x=>x.ClientId).Where(x=>x !=
null).FirstOrDefault()
                    }

On Fri, May 11, 2012 at 10:38 AM, Ryan Heath <ryan.q.he...@gmail.com> wrote:
> Oren,

> This assumes ClientId within the application document.
> Would it be possible to use Load in the map when the document did not
> have the clientid?

> // Ryan

> On Fri, May 11, 2012 at 10:42 AM, Oren Eini (Ayende Rahien)
> <aye...@ayende.com> wrote:
> > Why not just use:

> >      Map = applications => from a in applications
> >                                   select new
> >                                   {
> >                                       StateId = a.StateId,
> >                                       a.ClientId
> >                                   };

> > On Thu, May 10, 2012 at 11:18 PM, Ben <b...@planetcloud.co.uk> wrote:

> >> It may be that I'm trying to achieve too much with one index. Here are
> my
> >> documents:

> >> clients/1
> >> {
> >> "Name" : "Fabrikam"
> >> }

> >> vacancies/2
> >> {
> >> "Position" : "Developer Genius Guy",
> >> "ClientId" : "clients/1"
> >> }

> >> candidates/1
> >> {
> >> "Name": "John Doe"
> >> }

> >> candidates/2
> >> {
> >> "Name": "Bill Jones"
> >> }

> >> vacancyapplications/3
> >> {
> >> "VacancyId" : "vacancies/2",
> >> "CandidateId" : "candidates/1",
> >> "State" : "Unapproved"
> >> }

> >> vacancyapplications/4
> >> {
> >> "VacancyId" : "vacancies/2",
> >> "CandidateId" : "candidates/2",
> >> "State" : "Approved"
> >> }

> >> You can see that:

> >> Vacancy holds a reference to Client.
> >> VacancyApplication holds a reference to Vacancy and Candidate

> >> Originally I wanted to:

> >> GET ALL VACANCY APPLICATIONS THAT ARE UNAPPROVED

> >> I want the following information:

> >> ApplicationId
> >> VacancyId
> >> CandidateId
> >> ClientId
> >> ClientName
> >> Position
> >> CandidateName
> >> StateId

> >> Originally I was doing this with a regular index on State (since this
> was
> >> the only thing I was actually querying) and then getting all the other
> >> information in the transform results: This allowed me to effectively get
> >> from VacancyApplication to Client (via Vacancy):

> >>     public class VacancyApplications_Summary :
> >> AbstractIndexCreationTask<VacancyApplication, VacancyApplicationSummary>
> >>     {
> >>         public VacancyApplications_Summary()
> >>         {
> >>             Map = applications => from a in applications
> >>                                   select new
> >>                                   {
> >>                                       StateId = a.StateId,
> >>                                   };

> >>             TransformResults = (store, results) => from result in
> results
> >>                                                    let candidate =
> >> store.Load<Candidate>(result.CandidateId)
> >>                                                    let vacancy =
> >> store.Load<Vacancy>(result.VacancyId)
> >>                                                    let client =
> >> store.Load<Client>(vacancy.ClientId)
> >>                                                    orderby
> >> result.ReceivedDate descending
> >>                                                    select new
> >>                                                    {
> >>                                                        Id = result.Id,
> >>                                                        VacancyId =
> >> vacancy.Id,
> >>                                                        CandidateId =
> >> candidate.Id,
> >>                                                        ClientId =
> >> client.Id,
> >>                                                        ClientName =
> >> client.Profile.Name,
> >>                                                        Position =
> >> vacancy.Position,
> >>                                                        CandidateName =
> >> candidate.ContactDetails.FullName,
> >>                                                        ReceivedDate =
> >> result.ReceivedDate,
> >>                                                        StateId =
> >> result.StateId
> >>                                                    };

> >>         }
> >>     }

> >> The problem came when I needed to answer the following:

> >> GET ME ALL VACANCIES FOR CLIENT 1

> >> Of course if I try and query on ClientId I get:

> >> System.ArgumentException: The field 'ClientId' is not indexed, cannot
> >> query on fields that are not indexed

> >> because quite rightly, I am not indexing ClientId.

> >> So I figured that maybe a multi map index is the way to go for this,
> >> something like:

> >>             AddMap<VacancyApplication>(applications => from a in
> >> applications
> >>                                                        select new
> >>                                                        {
> >>                                                            Id = a.Id,
> >>                                                            VacancyId =
> >> a.VacancyId,
> >>                                                            CandidateId =
> >> a.CandidateId,
> >>                                                            ClientId =
> >> (string)null,
> >>                                                            StateId =
> >> a.StateId,
> >>                                                            ReceivedDate
> =
> >> a.ReceivedDate,
> >>                                                            Position =
> >> (string)null
> >>                                                        });

> >>             AddMap<Vacancy>(vacancies => from v in vacancies
> >>                                          select new
> >>                                          {
> >>                                              Id = (string)null,
> >>                                              VacancyId = v.Id,
> >>                                              CandidateId = (string)null,
> >>                                              ClientId = v.ClientId,
> >>                                              StateId = (string)null,
> >>                                              ReceivedDate =
> >> DateTime.MinValue,
> >>                                              Position = v.Position
> >>                                          });

> >> The thing is, I'm not sure how to group / reduce these results.

> >> With the above documents I would end up 2 VacancyApplications and 1
> >> Vacancy in the results. How can I reduce them so that I get 2 results
> (the
> >> applications) with the information I need from the Vacancy?


 
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