Solved

W/ LINQ return 1 product per location

Posted on 2013-11-12
4
53 Views
Last Modified: 2016-03-15
I have a map with products at locations.

Right now, I'm returning many products for each location.

However, I want to return a single product for each location.

This is my LINQ code.



		if (!String.IsNullOrEmpty(lystId))
		{
			//Only products in a lyst
			lystDistinct = (from l in dc.Lysts
								join mp in dc.MemberProductLysts on l.LystId equals mp.LystId
								join p in dc.Products on mp.ProductId equals p.ProductId
								join t in dc.Tags on p.TagId equals t.TagId
								join a in dc.Addresses on t.AddressId equals a.AddressId
								where l.LystId == new Guid(lystId)
								select a.AddressId).Distinct().ToList();
		}
		else
		{
			//All of the members products
			lystDistinct = (from l in dc.Lysts
								join mp in dc.MemberProductLysts on l.LystId equals mp.LystId
								join p in dc.Products on mp.ProductId equals p.ProductId
								join t in dc.Tags on p.TagId equals t.TagId
								join a in dc.Addresses on t.AddressId equals a.AddressId
								where l.MemberId == new Guid(System.Web.Security.Membership.GetUser().ProviderUserKey.ToString())
								select a.AddressId).Distinct().ToList();
		}

		var locationList = (from p in dc.Products
							join t in dc.Tags on p.TagId equals t.TagId
							join a in dc.Addresses on t.AddressId equals a.AddressId
							join pi in dc.ProductImages on p.ProductId equals pi.ProductId
							join i in dc.Images on pi.ImageId equals i.ImageId
							where lystDistinct.Contains(a.AddressId)
							where p.IsActive == true
							where t.IsActive == true
							// where t.IsPaying == true
							where t.RegionId == member.RegionId
							orderby dc.Random()
							select new { a.Latitude, a.Longitude, brandName = t.Name, productName = p.Name, i.FileName }).Distinct();

Open in new window

0
Comment
Question by:Rob Gaudet
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
  • 2
4 Comments
 
LVL 96

Expert Comment

by:Bob Learned
ID: 39644565
It sounds like you need the First operator, but I can't see where to add that.  You would need to find the correct sequence to apply that to.
0
 

Author Comment

by:Rob Gaudet
ID: 39648023
I was thinking the same thing, such as in a subquery of some kind.
0
 
LVL 96

Accepted Solution

by:
Bob Learned earned 500 total points
ID: 39648084
Is location based on a record in Address?

       join a in dc.Addresses on t.AddressId equals a.AddressId

I would think that you might be able to use a group by expression, with a FirstOrDefault operator:

var sessions =  
    from m in this.members                     
    join s in 
    (
        from se in this.sessions
        group se by se.Name into g
        select new {Name = g.Key, SessionEndTime = g.FirstOrDefault()}
    )   
    on m.Name equals s.Name                    
    select new { MemberName = m.Name, SessionTime = s.SessionEndTime}

Open in new window

0
 

Author Comment

by:Rob Gaudet
ID: 39648102
That makes sense. I will give it a try.
0

Featured Post

Free Tool: Postgres Monitoring System

A PHP and Perl based system to collect and display usage statistics from PostgreSQL databases.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Sometimes in DotNetNuke module development you want to swap controls within the same module definition.  In doing this DNN (somewhat annoyingly) swaps the Skin and Container definitions to the default admin selections.  To get around this you need t…
A quick way to get a menu to work on our website, is using the Menu control and assign it to a web.sitemap using SiteMapDataSource. Example of web.sitemap file: (CODE) Sample code to add to the page menu: (CODE) Running the application, we wi…
Exchange organizations may use the Journaling Agent of the Transport Service to archive messages going through Exchange. However, if the Transport Service is integrated with some email content management application (such as an antispam), the admini…
Are you ready to implement Active Directory best practices without reading 300+ pages? You're in luck. In this webinar hosted by Skyport Systems, you gain insight into Microsoft's latest comprehensive guide, with tips on the best and easiest way…

740 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question