Array of nested structs

Question

I am trying to write a simple election contract, currently trying to add candidates to an array of Candidates in my Election struct.

Can this be done and if so how can it be implemented? The code works fine when adding a single candidate without making it an array.

struct Candidate {
        uint256 candidateID;
        uint256 voteCount;
        string name;
    }
struct Elections {
        uint256 elecID;
        Candidate[] candidates;
    }

mapping(uint256 => Candidate) public candidates;
mapping(uint256 => Elections) public elections;
 

function createElection(string[] memory _names) public {
        electionCount++;
        
        
        elections[electionCount].candidates[0] = Candidate(0, 0, _names[0]);


        elections[electionCount].candidates[1] = Candidate(1, 0, _names[1]);
        //elections[electionCount] = Election(electionCount, _candidates);
        
    }

Answer 1

Yes, you can add an array of candidates to the elections struct.

Elections storage newElection = elections[electionCount];

newElection.candidates.push();

Candidate storage newCandidate = elections[electionCount].candidates[0];

newCandidate.candidateID = 0;
newCandidate.voteCount = 0;
newCandidate.name = "candidate name";

You can try something like this. Dynamic arrays can only be accessed in storage, not memory, which is something to keep in mind.

Also, you might want to take a look at this project: https://github.com/hjk216/CityVotingSC

Let me know if this helps.