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POQueryOver child collections giving cartesian products
 

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  1. POQueryOver child collections giving cartesian products
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    <p>I have a domain I am trying to query that looks like this (with other unimportant properties omitted) and related mapping:</p> <pre><code>// Domain: public class Order { public virtual Site Release { get; set;} public virtual Site Return { get; set;} } public class Site { public virtual Calendar { get; set; } } public class Calendar { public virtual IList&lt;HolidayDate&gt; Holidays { get; set; } } // Mapping: public class OrderMap : ClassMap&lt;Order&gt; { public OrderMap() { References(x =&gt; x.Release); References(x =&gt; x.Return); } } public class SiteMap : ClassMap&lt;Site&gt; { public SiteMap() { Component(x =&gt; x.Calendar, component =&gt; { component.Map(x =&gt; x.WorkingDays); component.HasMany(x =&gt; x.Holidays).Cascade.AllDeleteOrphan(); }); } } </code></pre> <p>I would like to query all orders, having a specific status and joining both <code>Release</code> and <code>Return</code> but for <code>Release</code>, I would like to also join in <code>Calendar</code> (which is a component-mapped entity) and for calendar I would like to join in all holidays (left outer join). I have tried a few different ways, but as soon as I try to join in holidays, I get a cartesian product (I assume I get both sites holidays).</p> <p>I also did an attempt with futures (like this):</p> <pre><code>var orders = Session.QueryOver&lt;Order&gt;() .Where(x =&gt; x.Status == Selected.Status) .Future&lt;Order&gt;(); Session.QueryOver&lt;Order&gt;() .JoinAlias(x =&gt; x.Release, () =&gt; release, JoinType.LeftOuterJoin) .JoinAlias(() =&gt; release.Calendar.Holidays, () =&gt; holiday, JoinType.LeftOuterJoin) .Where(x =&gt; x.Status == Selected.Status) .Future&lt;Order&gt;(); var output = orders.ToList(); </code></pre> <p>...but I still get more holidays than I expect. If I can get a query figured out, I would also like to filter holidays where <code>Date</code> > todays date.</p> <p>Is it at all possible to perform this query or is there an option I have missed?</p>
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    1. UScarl
    1. UScarl
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    1. COHave you read this post http://ayende.com/blog/4367/eagerly-loading-entity-associations-efficiently-with-nhibernate As you are join 3 levels deep you need to run two queries... Let me know how you get on and I post as answer
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      1. USRippo
    2. COYes, i read that post and tried with HQL (like i did with QueryOver in my question, but no luck).
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      1. POQueryOver child collections giving cartesian products
      1. UScarl
    3. COyour first query in your example above have two joins to a many table (calendar and holiday) which is why you are getting a big Cartesian product
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      1. USRippo
 

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