无法使用Apollo过滤GraphQL查询并显示数据库数据对象

Question

I am trying to use a form input in react to filter my mongodb database with graphql and apollo. I have the backend set up and working. I have the front end mostly working except I can't access my data in an apollo query. Not sure what I am missing so not sure the exact question to ask. I am just doing a search or query not a mutation. I have 3 components in my React app and I am using styled-components. I just want to capture the form input data and store it in the apollo query for use. I want to call <h1>{data.herb.name}</h1> and get the data object from my apollo server.

I know this is a full stack question so if you can't help maybe you can give me suggestions on how to better ask this in smaller chunks. Thanks.

App.js

import React, { Component } from 'react'
import ApolloClient from 'apollo-boost'
import { ApolloProvider } from 'react-apollo'
import { BrowserRouter as Router, Route, Switch } from 'react-route-dom'

import Home from './components/Home'
import Herb from './components/Herb'

const client = new ApolloClient({
 uri: 'http://localhost:4000/graphql',
})

export default class App extends Component {
 render() {
   return (
    <ApolloProvider client={client}>
     <Router>
      <Switch>
        <Route exact path="/" component={Home} />
        <Route path="/:herbId" component={Herb} />
      </Switch>
     </Router>
    </ApolloProvider>
  )
 }
}

Home.js

import React, { Component } from 'react'
import styled from 'styled-components'

import SearchInput from './Search'
import Herb from './Herb'
import bgImage from '../Elements/images/measure_colorized.jpg'

const HomeContainer = styled.div`
  width: 100vw;
  height: 100vh;
  background: url(${bgImage});
  background-size: cover;
  background-repeat: no-repeat;
`

const Title = styled.h1`
  font-size: 6rem;
  color: #fff;
`

export default class Home extends Component {
  state = { name: '' }

  handleInput = e => {
    const formData = {}
    formData[e.target.name] = e.target.value
    this.setState({ ...formData })
  }

  render() {
    const { name } = this.state
    return (
      <HomeContainer>
        <header>
          <Title>Measure App</Title>
        </header>
        <SearchInput name={name} onChangeValue={this.handleInput} />
        <Herb name={name} />
      </HomeContainer>
    )
  }
}

Search.js

import React, { Component, Fragment } from 'react'
import styled from 'styled-components'
import { Query } from 'react-apollo'
import gql from 'graphql-tag'

const SearchInput = styled.input`
  background: rgba(0, 0, 0, 0.6);
  width: 30vw;
  padding: 1rem;
  font-size: 1.6rem;
  color: white;
  border: none;
`

const SubmitBTN = styled.button`
  padding: 1rem;
  font-size: 1.6rem;
  border: none;
  background: #7ff2ca;
`

export default class Search extends Component {
  handleSubmit = e => {
    e.preventDefault()
  }

  render() {
    const { name, onChangeValue } = this.props
    return (
      <div>
        <Query query={GET_HERB_QUERY} variables={{ name }}>
          {(data, loading, error) => {
            if (loading) return 'Loading...'
            if (error) return `Error: ${error.message}`
            console.log(data)
            return (
              <Fragment>
                <SearchInput
                  name="name"
                  type="text"
                  placeholder="search"
                  value={name}
                  onChange={onChangeValue}
                />
                <SubmitBTN onClick={this.handleSubmit}>convert</SubmitBTN>
              </Fragment>
            )
          }}
        </Query>
      </div>
    )
  }
}

//writing query to fetch herb that matches search result
const GET_HERB_QUERY = gql`
  query searchHerbs($name: String) {
    herb(name: $name) {
      name
      description
      imageURL
    }
  }
`

Answer 1

As explained in the comment, when you wrap your component with a query, the query will be triggered when your component renders.

You can manually fire the query and manage data as you wish. And you can also use the refetch method using the wrapper to trigger the query again with different variables.