Invalid bind expression type of Task for column of type Id

Question

I tried to get all related tasks from the selected contact, but salesforce don't like my code. If I try to save I get the error: Invalid bind expression type of Task for column of type Id

What I'm doing wrong?

          List<Taskrelation> RelatedTasks = [select taskId from taskrelation where relationid =: currentRecordId];
            for (task rt : RelatedTasks) {
                for(Task a: [select Id, Subject, CreatedDate, Createdby.Name, Owner.Name, RecordType.Name, Status, Who.Name, Who.Id, What.Name from Task where Id =:rt]) { 
                    wrapperList.add(new Wrapper(a, 'task'));
                } 
            }

Answer 1

First coming to the issue

[select Id, Subject, CreatedDate, Createdby.Name, Owner.Name, RecordType.Name, Status, Who.Name, Who.Id, What.Name from Task where Id =:rt]

Here rt is sObject , whereas it should be Id

[select Id, Subject, CreatedDate, Createdby.Name, Owner.Name, RecordType.Name, Status, Who.Name, Who.Id, What.Name from Task where Id =:rt.Id]

Secondly, you should always avoid SOQL in for loop. You can move this query outside loop and pass relatedTaskIds. And insert data to relatedTaskIds after looping through RelatedTasks for eg:

for(Task a: [select Id, Subject, CreatedDate, Createdby.Name, Owner.Name, RecordType.Name, Status, Who.Name, Who.Id, What.Name from Task where Id In :relatedTaskIds]) {
    wrapperList.add(new Wrapper(a, 'task'));
}