不调用Redux'dispatch'函数

Question

import firebase from "firebase";
import "firebase/firestore";
import moment from "moment";
import firebaseApp from "../firestoreConfig";
import { config } from "../../App";
import FETCH_PRICES from "./types";

const firestore = firebaseApp.firestore();

export const getPrices = () => {
  return dispatch => {
    let prices;
    firestore
      .collection("settings-daily-market")
      .orderBy("MarketDate", "desc")
      .limit(1)
      .get()
      .then(snapshot => {
        snapshot.forEach(doc => {
          const Pd = doc.data().PdMarket;
          const Pt = doc.data().PtMarket;
          const Rh = doc.data().RhMarket;
          prices = { Pd, Pt, Rh };
          console.log(prices);
        });
        dispatch({ type: FETCH_PRICES, payload: prices });
        console.log("dispatched");
      });
  };
};

运行价格的console.log但第二个console.log（'dispatched'）从不这样做，并且没有“FETCH_PRICES”类型的reducer代码运行。相反，我得到一个错误：

“YellowBox.js：82可能未处理的承诺拒绝（id：0）：错误：操作可能没有未定义的”类型“属性。你拼错了一个常量吗？”

为什么dispatch（）不起作用？

Answer 1

我想你想要import { FETCH_PRICES } from "./types";因为我无法想象你导出FETCH_PRICES是默认的。