Function updateDoc

lib/index-browser.js:4508–4572

(revLimit, prev, docInfo, results,
                   i, cb, writeDoc, newEdits)

}

function updateDoc(revLimit, prev, docInfo, results,
                   i, cb, writeDoc, newEdits) {

  if (revExists(prev.rev_tree, docInfo.metadata.rev) && !newEdits) {
    results[i] = docInfo;
    return cb();
  }

  // sometimes this is pre-calculated. historically not always
  var previousWinningRev = prev.winningRev || winningRev(prev);
  var previouslyDeleted = 'deleted' in prev ? prev.deleted :
    isDeleted(prev, previousWinningRev);
  var deleted = 'deleted' in docInfo.metadata ? docInfo.metadata.deleted :
    isDeleted(docInfo.metadata);
  var isRoot = /^1-/.test(docInfo.metadata.rev);

  if (previouslyDeleted && !deleted && newEdits && isRoot) {
    var newDoc = docInfo.data;
    newDoc._rev = previousWinningRev;
    newDoc._id = docInfo.metadata.id;
    docInfo = parseDoc(newDoc, newEdits);
  }

  var merged = merge(prev.rev_tree, docInfo.metadata.rev_tree[0], revLimit);

  var inConflict = newEdits && ((
    (previouslyDeleted && deleted && merged.conflicts !== 'new_leaf') ||
    (!previouslyDeleted && merged.conflicts !== 'new_leaf') ||
    (previouslyDeleted && !deleted && merged.conflicts === 'new_branch')));

  if (inConflict) {
    var err = createError(REV_CONFLICT);
    results[i] = err;
    return cb();
  }

  var newRev = docInfo.metadata.rev;
  docInfo.metadata.rev_tree = merged.tree;
  docInfo.stemmedRevs = merged.stemmedRevs || [];
  /* istanbul ignore else */
  if (prev.rev_map) {
    docInfo.metadata.rev_map = prev.rev_map; // used only by leveldb
  }

  // recalculate
  var winningRev$$1 = winningRev(docInfo.metadata);
  var winningRevIsDeleted = isDeleted(docInfo.metadata, winningRev$$1);

  // calculate the total number of documents that were added/removed,
  // from the perspective of total_rows/doc_count
  var delta = (previouslyDeleted === winningRevIsDeleted) ? 0 :
    previouslyDeleted < winningRevIsDeleted ? -1 : 1;

  var newRevIsDeleted;
  if (newRev === winningRev$$1) {
    // if the new rev is the same as the winning rev, we can reuse that value
    newRevIsDeleted = winningRevIsDeleted;
  } else {