How to set up Pinia getter in Vue 3 Composition API - vue.js

Question

I am building a Pokemon filtered search app using Vue 3, Composition API, and Pinia. I am attempting to set up the app so that the fetched response from the Pokemon API is passed to a store (set up using Pinia) inside the fetchPokemon() function.
const fetchPokemon = () => {
axios.get("https://pokeapi.co/api/v2/pokemon?offset=0")
.then((response) => {
store.addPokemon(response.data.results)
})
}
After passing the response to the store, the updatePokemon() function uses filter and include methods to filter out and match Pokemon in the store with Pokemon in the user-input text field ("state.text"):
const updatePokemon = () => {
if(!state.text) {
return []
}
return store.getState.pokemons.filter((pokemon) =>
pokemon.name.includes(state.text)
)
}
When executing the app, I am getting the following error in the updatePokemon() function:
Uncaught (in promise) TypeError: Cannot read properties of undefined (reading 'includes')
I'm assuming this means the .includes() method for searching/filter cannot be used for this search. How should I go about handling the filter and include methods to match Pokemon in the store with the user-inputted Pokemon?
Here is the code:
Pinia Store
import { defineStore } from 'pinia'
export const usePokemonStore = defineStore({
id: 'store',
state: () => ({
pokemons: []
}),
getters: {
getState(state) {
return state
}
},
actions: {
addPokemon(name) {
this.pokemons.push(name)
}
}
})
Component
<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/${getPokemonId(pokemon.name)}`">
{{ pokemon.name }} - with id {{ getPokemonId(pokemon.name) }}
</router-link>
</div>
</div>
</template>
<script>
import axios from 'axios';
import { reactive, toRefs, computed } from 'vue';
import { usePokemonStore } from '#/store';
export default {
name: 'Home',
setup() {
const store = usePokemonStore()
const state = reactive({
text: "",
filteredPokemon: computed(()=> updatePokemon())
})
const updatePokemon = () => {
if(!state.text) {
return []
}
return store.getState.pokemons.filter((pokemon) =>
pokemon.name.includes(state.text)
)
}
const fetchPokemon = () => {
axios.get("https://pokeapi.co/api/v2/pokemon?offset=0")
.then((response) => {
store.addPokemon(response.data.results)
})
}
fetchPokemon()
const getPokemonId = (item) => {
console.log(item)
return store.pokemons.findIndex((p) => p.name === item) + 1
}
return { ...toRefs(state), fetchPokemon, getPokemonId, updatePokemon, store }
}
}
</script>
UPDATED
Store - with not action
import { defineStore } from 'pinia'
export const usePokemonStore = defineStore({
id: 'store',
state: () => ({
pokemons: []
})
})
Component - with no store.addPokemon(...)
<template>
<div class="w-full flex justify-center">
<input type="text" placeholder="Enter Pokemon here"
class="mt-10 p-2 border-blue-500 border-2" v-model="text"/>
</div>
<div class="mt-10 p-4 flex flex-wrap justify-center">
<div class="ml-4 text-2x text-blue-400"
v-for="(pokemon, idx) in filteredPokemon" :key="idx">
<router-link :to="`/about/${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

First of all, you don't need getState at all.
You can use usePokemonStore().pokemons directly. The object returned by calling usePokemonStore() function includes:
all state properties
all actions
all getters.
Here's how to get the filtered pokemon array, based on whether their name includes state.text:
setup() {
const store = usePokemonStore();
const state = reactive({
text: "",
filteredPokemons: computed(() => store.pokemons.filter(
pokemon => pokemon.name.includes(state.text)
))
});
return {
...toRefs(state)
}
}
Working example:
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>