Hi.
I saw DamienG's article (http://damieng.com/blog/2009/06/24/client-side-properties-and-any-remote-linq-provider) in how
to map client properties
to sql.
i ran throgh this article, and i saw great potential in it. Definitely mapping client properties
to SQL is an awesome idea.
But i wanted
to use this for something a bit more complicated then just concatenating strings. Atm we are trying
to introduce multilinguality
to our Business objects, and i hoped we could leave all the existing linq2sql queries intact, and just change the
code of the multilingual properties, so they would actually return the given property in the CurrentUICulture.
The first idea was
to change these fields
to XMLs, and then try the Object.Property.Elements().Where(...), but it got stuck on the Elements(), as it couldnt translate it
to sql. I read somewhere that XML fields are actually regarded as strings, and only on the app server they become XElements, so this way the filtering would be on the app server anyways, not the DB. Fair point, it wont work like this. Lets try something else...
SO the second idea was
to create a PolyGlots table (name taken from http://weblogic.sys-con.com/node/102698?page=0,1), a PolyGlotTranslations table and a Culture table, where the PolyGlots would be referenced from each internationalized property. This way i wanted
to say for example:
private static readonly CompiledExpression<Announcement, string> nameExpression
= DefaultTranslationOf<Announcement>
.Property(e => e.Name)
.Is(e=> e.NamePolyGlot.PolyGlotTranslations
.Where(t=> t.Culture.
Code == Thread.CurrentThread.CurrentUICulture.Name)
.Single().Value
);
now unfortunately here i get an error that the Where() function cannot be translated
to sql, what is a bit disappointing, as i was sure it will go through.
I guess it is failing, cause the IEntitySet is basically an IEnumerable, not IQueryable, am i right?
Is there another way
to use the compiledExpressions class
to achieve this goal?
Any help appreciated.
