TypeError at compile for public mapping of address ==> uint?

Question

Maybe this is really obvious but for some reason I can't shake this error. At compile I get the following error:

TypeError: Indexed expression has to be a type, mapping or array (is uint256)
        voteType[msg.sender] = 2;
        ^------^
Compilation failed. See above.

The indexed expression is a mapping to a type (uint) which should be all good.

Relevant code:

function castVote (uint voteType) canVote {
//        require (voteType[msg.sender] == 0);
        if (voteType == 2) {//2 here meaning "Real" account.
        count[upForVote].voteReal++;
        voteType[msg.sender] = 2;
        }
        if (voteType == 1) {//1 here meaning "Fake" acount.
        count[upForVote].voteFake++;
        voteType[msg.sender] = 1;
        }
        voteInProgress[msg.sender] = true;
    }

Answer 1

Your function accepts a parameter called voteType, and it's a uint. So you can't index into it, because it's not an array or a mapping.

My guess is that elsewhere you declared a state variable also called voteType, but it's being shadowed by the parameter name in this function.

One convention in these cases is to use a leading underscore to differentiate, although that's usually for the case where both variables have the same type:

function castVote (uint _voteType) canVote {
    if (_voteType == 2) {  //2 here meaning "Real" account.
        count[upForVote].voteReal++;
        voteType[msg.sender] = 2;
    }
    if (_voteType == 1) {  //1 here meaning "Fake" acount.
        count[upForVote].voteFake++;
        voteType[msg.sender] = 1;
    }
    voteInProgress[msg.sender] = true;
}