From: Ryan Williams <ryan@...>
Date: 2006-03-17T20:32:50+09:00
Subject: deleting from hash question

I'm a ruby newbie and have what is probably a relatively simple problem 
I'm trying to solve (though I'm using rails, this is more a ruby 
question). Say that I created a hash:

TASKS = {
    "homework" => "Do Your Homework",
    "chores" => "Your Have Chores",
    "exercise" => "Don't Forget to Exercise"
  }

and then I had an Assignment model with:

def self.find_assignments(person)
    find(:all, :conditions => ["person_id = ?", person .id])
end

Which I called in the controller like so:

@current_assignments = Assignment.find_assignments(@person)

So, @current_assignments works fine. Now, the problem. I want to display 
the tasks which have NOT yet been assigned (so that they can be assigned 
if desired). In the assignments table, I have a column called 'tasks' 
which correlates with the keys in the TASKS hash. So I just want to 
remove any key=>value pairs from TASKS that match with the 'tasks' 
column in @current_assignment and then loop through the resulting new 
hash in the view.

I'm at a loss as how best to do this. It must be something so simple 
it's eluding me. Any suggestions?

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