Solc 0.7.0 rejects construction of my struct with a mapping member

My npm installation provides Solc version 0.7.0. Creating a Struct with a mapping inside emits the message: "Struct containing a (nested) mapping cannot be constructed."

Here is the code to look at:

// SPDX-License-Identifier: MIT
pragma solidity 0.7.0;

contract Store {
  struct Submission {
    uint256 amount;
    mapping(address => bool) votes;
  }
  Submission[] public submissions;
    ...

  function addSubmission(
    uint256 amount
  ) public {
    Submission memory fresh = Submission({ // compiler reports the error here
      amount: amount
    });

    submissions.push(fresh);
  }
}

With earlier solc versions, this same code builds successfully.

Thanks for taking a look!

The conversation continues 2

Follow the reasoning

han_seo23 Oct

This ought to work:

function addSubmission(uint256 amount) public {
  Submission storage fresh = submissions.push();
  fresh.amount = amount;
}

Best!

drawer610 hours ago

Here's what worked for me:

struct Submission {
  uint256 amount;
  mapping(address => bool) votes;
}

uint256 submissionCount;
mapping(uint256 => Submission) submissions;

function addSubmission(uint256 amount) public {
  Submission storage fresh = submissions[submissionCount++];
  fresh.amount = amount;
}

Solc 0.7.0 rejects construction of my struct with a mapping member

The conversation continues 2

Other sides of the same question

Testing D arrays for a matching entry

rows.Next said false and the error went nowhere

A partial index and a parameter in the WHERE clause