mingo/esm/operators/update/pull.js

MongoDB query language for in-memory objects

import { Query } from "../../query";
import { isObject, isOperator } from "../../util";
import { applyUpdate, DEFAULT_OPTIONS, walkExpression } from "./_internal";
const $pull = (obj, expr, arrayFilters = [], options = DEFAULT_OPTIONS) => {
  return walkExpression(expr, arrayFilters, options, (val, node, queries) => {
    const wrap = !isObject(val) || Object.keys(val).some(isOperator);
    const query = new Query(wrap ? { k: val } : val, options);
    const pred = wrap ? (v) => query.test({ k: v }) : (v) => query.test(v);
    return applyUpdate(obj, node, queries, (o, k) => {
      const prev = o[k];
      const curr = new Array();
      let ok = false;
      prev.forEach((v) => {
        const b = pred(v);
        if (!b) curr.push(v);
        ok ||= b;
      });
      if (!ok) return false;
      o[k] = curr;
      return true;
    });
  });
};
export {
  $pull
};