Question

I want to do a sort of filtering chain to filter Receipt objects using queryOver functionality.
The chain can differ in length, according to the parameters user chooses on the screen.

Eventually, I want the chain to run somehow like this:

public IList<Receipt> RunFilters()
{
    IQueryOver<Receipt, Receipt> currQuery = NHibernateHelper.Session.QueryOver<Receipt>();

    foreach (var item in filters)
    {
        currQuery = item.RunFilter(currQuery);
    }
    return currQuery.List();
}

So, the question is – how RunFilter should be defined? I thought it should be

public IQueryOver<Receipt, Receipt> RunFilter(IQueryOver<Receipt, Receipt> prevFilter)

and they I can do filters like

return prevFilter.Where(receipt => receipt.TotalSum > 0);

But I can’t do

return prevFilter.JoinQueryOver(v => v.Store).Where(vv => vv.Name.Equals(m_storeName));

Any ideas?
Thanks in advance

Victor

Answer 1

return prevFilter.JoinQueryOver(v => v.Store).Where(vv => vv.Name.Equals(m_storeName));

the above can be written as

Store storeAlias = null;
return prevFilter.JoinAlias(v => v.Store, () => storeAlias).Where(() => storeAlias.Name == m_storeName);

EDIT: fixed equation