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POLinq to SQL DTOs and composite objects
 

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    <p>I am using a similar approach to others in keeping my LINQ objects in my LINQ data provider and returning an IQueryable to allow filtering etc. This works fine for filtering a simple object by it's ID or other property, but I am having a problem with a join table object that is composed of other child objects</p> <pre><code> //CoreDBDataContext db = coreDB; public IQueryable&lt;DTO.Position&gt; GetPositions() { return from p in coreDB.Positions select new DTO.Position { DTO.User = new DTO.User(p.User.id,p.User.username, p.User.firstName,p.User.lastName,p.User.email,p.User.isActive), DTO.Role = new DTO.Role(p.Role.id, p.Role.name, p.Role.isActive), DTO.OrgUnit = new DTO.OrgUnit(p.OrgUnit.id,p.OrgUnit.name,p.OrgUnit.isActive) }; </code></pre> <p>The coreDB.Positions is my Linq Position Object and I am returning a DTO Position which is composed of a User, OrgUnit and Role (the underlying table is a join table with UserID, RoleID, and OrgUnitID)</p> <p>The problem I am having is that when I try to add a filter on the Iqueryable I get a SQL Error saying that there is no translation available for my DTO.User object</p> <pre><code>public static IQueryable&lt;Position&gt; WithUserID(this IQueryable&lt;Position&gt; query, int userID) { return query.Where(p =&gt; p.User.ID == userID); } </code></pre> <p>I am at a complete loss as to how to go about resolving this, as all of my Google results seem to be with people working directly with the generated LINQ objects</p> <p>Any thought as to how to make this work, or am I doing something completely wrong here?</p> <p>Thanks</p>
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