vue.js - 如何在 Vue 3 Composition API 中设置 Pinia getter

Question

我正在使用 Vue 3、Composition API 和 Pinia 构建一个 Pokemon 过滤搜索应用程序。我正在尝试设置应用程序，以便将从 Pokemon API 获取的响应传递到 fetchPokemon() 函数内的商店(使用 Pinia 设置)。

    const fetchPokemon = () => {
      axios.get("https://pokeapi.co/api/v2/pokemon?offset=0")
      .then((response) => {
        store.addPokemon(response.data.results)
      })
    }

将响应传递给商店后，updatePokemon() 函数使用 filter 和 include 方法过滤出商店中的 Pokemon 并将其与用户输入文本字段(“state.text”)中的 Pokemon 进行匹配:

    const updatePokemon = () => {
      if(!state.text) {
        return []
      }
      return store.getState.pokemons.filter((pokemon) => 
        pokemon.name.includes(state.text)
      )
    }

执行应用程序时，我在 updatePokemon() 函数中收到以下错误:

Uncaught (in promise) TypeError: Cannot read properties of undefined (reading 'includes')

我假设这意味着搜索/过滤的 .includes() 方法不能用于此搜索。我应该如何处理过滤器并包含将商店中的 Pokemon 与用户输入的 Pokemon 相匹配的方法？

代码如下:

Pinia 商店

import { defineStore } from 'pinia'

export const usePokemonStore = defineStore({
    id: 'store',
    state: () => ({
        pokemons: []
    }),
    getters: {
        getState(state) {
            return state
        }
    },
    actions: {
        addPokemon(name) {
            this.pokemons.push(name)
        }
    }
})

组件

<template>
  <div class="w-full flex justify-center">
    <input type="text" placeholder="Enter Pokemon here" 
    class="mt-10 p-2 border-blue-500 border-2" v-model="text"/>
  </div>
  <div class="mt-10 p-4 flex flex-wrap justify-center">
    <div class="ml-4 text-2x text-blue-400" 
    v-for="(pokemon, idx) in filteredPokemon" :key="idx">
      <router-link :to="`/about/${getPokemonId(pokemon.name)}`">
        {{ pokemon.name }} - with id {{ getPokemonId(pokemon.name) }}
      </router-link>
    </div>
  </div>
</template>

<script>
import axios from 'axios';
import { reactive, toRefs, computed } from 'vue';
import { usePokemonStore } from '@/store';

export default {
  name: 'Home',
  setup() {

    const store = usePokemonStore()

    const state = reactive({
      text: "",
      filteredPokemon: computed(()=> updatePokemon())
    })

    const updatePokemon = () => {
      if(!state.text) {
        return []
      }
      return store.getState.pokemons.filter((pokemon) => 
        pokemon.name.includes(state.text)
      )
    }

    const fetchPokemon = () => {
      axios.get("https://pokeapi.co/api/v2/pokemon?offset=0")
      .then((response) => {
        store.addPokemon(response.data.results)
      })
    }

    fetchPokemon()

    const getPokemonId = (item) => {
      console.log(item)
      return store.pokemons.findIndex((p) => p.name === item) + 1
    }

    return { ...toRefs(state), fetchPokemon, getPokemonId, updatePokemon, store }
  }
}
</script>

已更新

存储 - 没有 Action

import { defineStore } from 'pinia'

export const usePokemonStore = defineStore({
    id: 'store',
    state: () => ({
        pokemons: []
    })
})

组件 - 没有 store.addPokemon(...)

<template>
  <div class="w-full flex justify-center">
    <input type="text" placeholder="Enter Pokemon here" 
    class="mt-10 p-2 border-blue-500 border-2" v-model="text"/>
  </div>
  <div class="mt-10 p-4 flex flex-wrap justify-center">
    <div class="ml-4 text-2x text-blue-400" 
    v-for="(pokemon, idx) in filteredPokemon" :key="idx">
      <router-link :to="`/about/${getPokemonId(pokemon.name)}`">
        {{ pokemon.name }} - with id {{ getPokemonId(pokemon.name) }}
      </router-link>
    </div>
  </div>
</template>

<script>
import axios from 'axios';
import { reactive, toRefs, computed } from 'vue';
import { usePokemonStore } from '@/store';

export default {
  name: 'Home',

  setup() {

    const store = usePokemonStore()

    const state = reactive({
      // pokemons: [],
      text: "",
      filteredPokemon: computed(()=> updatePokemon())
    })

    const updatePokemon = () => {
      if(!state.text) {
        return []
      }
      return store.pokemons.filter((pokemon) => 
        pokemon.name.includes(state.text)
      )
    }

    const fetchPokemon = () => {
      axios.get("https://pokeapi.co/api/v2/pokemon?offset=0")
      .then((response) => {
        store.pokemons = response.data.results
      })
    }

    fetchPokemon()

    const getPokemonId = (item) => {
      console.log(item)
      return store.pokemons.findIndex((p) => p.name === item) + 1
    }

    return { ...toRefs(state), fetchPokemon, getPokemonId, store }
  }
}
</script>

Answer 1

首先，您根本不需要getState。

您可以直接使用usePokemonStore().pokemons。调用usePokemonStore()函数返回的对象包括:

• 所有国家属性(property)
• 所有 Action
• 所有 setter/getter 。

下面是根据它们的名称是否包含 state.text 来获取过滤后的 pokemon 数组的方法:

setup() {
  const store = usePokemonStore();
  const state = reactive({
    text: "",
    filteredPokemons: computed(() => store.pokemons.filter(
      pokemon => pokemon.name.includes(state.text)
    ))
  });
  return {
    ...toRefs(state)
  }
}

工作示例:

const { createApp, reactive, toRefs, computed, onMounted } = Vue;
const { defineStore, createPinia } = Pinia;

const usePokemons = defineStore('pokemon', {
  state: () => ({ pokemons: [] })
});
const pinia = createPinia();
createApp({
  pinia,
  setup() {
    const store = usePokemons(pinia);
    const state = reactive({
      searchTerm: '',
      filteredPokemons: computed(() => store.pokemons.filter(
        pokemon => pokemon.name.includes(state.searchTerm)
      ))
    });
    onMounted(() => {
      fetch('https://pokeapi.co/api/v2/pokemon?offset=0')
        .then(r => r.json())
        .then(r => store.pokemons = r.results)
    });
    return {
      ...toRefs(state)
    }
  }
}).mount('#app')

<script src="https://unpkg.com/vue@3/dist/vue.global.prod.js"></script>
<script src="https://unpkg.com/vue-demi"></script>
<script src="https://unpkg.com/pinia@2.0.11/dist/pinia.iife.prod.js"></script>
<div id="app">
  <input v-model="searchTerm">
  <div v-for="pokemon in filteredPokemons">
    {{ pokemon.name }}
  </div>
</div>