Tables :
Component ComponentRights
-------------- ----------------
ComponentId (PK) ComponentRightsID
ComponentName ComponentId (FK)
RoleId
Lets say MyRoleId =2;
Now, I want to get all the records from both the tables but based on one condition. If I get same record but with different RoleId, then it should take only one record where RoleId = MyRoleId. If no duplicates, then condition is skipped.
Example:
Record 1:
------------
ComponentId = 1,
ComponentName = 'SampleComponent'
RoleId = 1
Record 2 :
-----------
ComponentId = 1,
ComponentName = 'SampleComponent'
RoleId = 2
* So In this case I should get Record 2.
Here is my sample code:
var Components = (from components in MyDB.Component
join componentRights in MyDB.ComponentRights on components.ComponentId equals componentRights.ComponentId
into AllComponents
from allComponent in AllComponents.DefaultIfEmpty()
where !(components.IsDeleted)
select new ComponentRightsModel()
{
ComponentRightsId = (!allComponent.IsDeleted) ? (Guid?)allComponent.ComponentRightsId : null,
ComponentId = components.ComponentUID,
ComponentName = components.ComponentName,
RoleId = allComponent.RoleId
}).ToList();
I'd suggest decomposing the problem into separate statements...
var Components = (from components in MyDB.Component
join componentRights in MyDB.ComponentRights on components.ComponentId equals componentRights.ComponentId
into AllComponents
from allComponent in AllComponents.DefaultIfEmpty()
where !(components.IsDeleted)
select new ComponentRightsModel()
{
ComponentRightsId = (!allComponent.IsDeleted) ? (Guid?)allComponent.ComponentRightsId : null,
ComponentId = components.ComponentUID,
ComponentName = components.ComponentName,
RoleId = allComponent.RoleId
});
var uniqueComponetIds = Components.GroupBy(x=>x.ComponentId).Select(x=> new {ComponentId = x.Key, Count = x.Count(y=>y.RoleId)}).Where(x=>x.Count == 1).Select(x=>x.ComponentId);
var filteredDuplicates = Components.Where(x=> !uniqueComponetIds.Contains(x.ComponentId) && x.RoleId == MyRoleId);
var finalComponents = Components.Where(x=> uniqueComponetIds.Contains(x.ComponentId).Concat(filteredDuplicates);
Note that this query would also filter out records where the component is duplicated but where the duplicated collected doesn't happen to have a role with RoleId == MyRoleId. If you want to include these as well, you can add a third statement to capture these as well.
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