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'use strict';
const get = require('../get');
/** * Given an update, move all $set on immutable properties to $setOnInsert. * This should only be called for upserts, because $setOnInsert bypasses the * strictness check for immutable properties. */
module.exports = function moveImmutableProperties(schema, update, ctx) {  if (update == null) {    return;  }
  const keys = Object.keys(update);  for (const key of keys) {    const isDollarKey = key.startsWith('$');
    if (key === '$set') {      const updatedPaths = Object.keys(update[key]);      for (const path of updatedPaths) {        _walkUpdatePath(schema, update[key], path, update, ctx);      }    } else if (!isDollarKey) {      _walkUpdatePath(schema, update, key, update, ctx);    }
  }};
function _walkUpdatePath(schema, op, path, update, ctx) {  const schematype = schema.path(path);  if (schematype == null) {    return;  }
  let immutable = get(schematype, 'options.immutable', null);  if (immutable == null) {    return;  }  if (typeof immutable === 'function') {    immutable = immutable.call(ctx, ctx);  }
  if (!immutable) {    return;  }
  update.$setOnInsert = update.$setOnInsert || {};  update.$setOnInsert[path] = op[path];  delete op[path];}