reactjs - 将 redux 状态复制到本地状态是否违反 redux 哲学？

Question

import React, { Component } from 'react'
import _ from 'lodash'
import { PageHeader, Row, Col, FormGroup, ControlLabel, Button, FormControl, Panel } from 'react-bootstrap'

import FieldGroup from '../fieldGroup/fieldGroup'
import PassagePreview from './preview'

class PassageDetail extends Component {
  constructor(props) {
    super(props)

    this.handleChange = this.handleChange.bind(this)

    this.state = {
      passageDetails: {}
    }

  }

  componentDidMount() {
    this.props.fetchPassage(this.props.params.passageId)
  }

  componentWillReceiveProps(nextProps) {
    if(nextProps.passageState.passageStatus === 'success') {
      this.setState({passageDetails: nextProps.passageState.passage})
    }
  }

  handleChange(e) {
    let passageDetails = this.state.passageDetails

    passageDetails[e.target.name] = e.target.value

    this.setState({passageDetails})
  }

  render() {
    if(this.props.passageState.passageStatus !== 'success') {
      return null
    }
    return (
      <div>
        <PageHeader>
          Create Passage
        </PageHeader>
        <Row>
          <Col md={6}>
            <FieldGroup
              type="text"
              label="Passage Title"
              name="title"
              onChange={this.handleChange}
              value={this.state.passageDetails.title}
            />

            <FieldGroup
              type="text"
              label="Passage Author"
            />
            <FormGroup>
              <ControlLabel>Passage Text</ControlLabel>
              <FormControl componentClass="textarea" placeholder="textarea" rows="20" />
            </FormGroup>
          </Col>
          <Col md={6}>
            <PassagePreview passageDetails={this.state.passageDetails} />
          </Col>
        </Row>

        <Row>
          <Col md={6} mdOffset={6}>
            <Button block bsStyle="primary">Create Passage</Button>
          </Col>
        </Row>
      </div>
    )
  }
}

export default PassageDetail

那是我的组件。容器是:

import { connect } from 'react-redux'
import * as PassagesActions from '../actions/passages'
import PassageMain from '../components/passage/main'

const mapStateToProps = (state) => {
  return {
    passageState: state.PassageReducer
  }
}

const mapDispatchToProps = (dispatch) => {
  return {
    fetchPassages: () => {
      const params = {
        url: `${process.env.REACT_APP_API_ENDPOINT}/passages`
      }
      dispatch(PassagesActions.fetchData(params, 'passages'))
    },
    fetchPassage: (passageId) => {
      const params = {
        url: `${process.env.REACT_APP_API_ENDPOINT}/passages/${passageId}`
      }
      dispatch(PassagesActions.fetchData(params, 'passage'))
    }
  }
}

export default connect(
  mapStateToProps, mapDispatchToProps
)(PassageMain)

所以你可以看到，在我的 componentDidMount 中，我正在执行 API 调用(通过 redux)，在 componentWillReceiveProps 中，我正在将其复制到本地状态。这个想法是，如果我对我的 passage 进行更改，它是在组件级别完成的，然后我可以通过一些尚未创建的 redux 操作将该对象传回.

这在 redux 哲学中可以接受吗？我仍然对 redux 很感兴趣，所以如果这个问题没有意义，我深表歉意。

Answer 1

其他评论提出了一些很好的观点，但也夸大了事实。根据 Redux 常见问题解答 http://redux.js.org/docs/faq/OrganizingState.html#organizing-state-only-redux-state :

Using local component state is fine. As a developer, it is your job to determine what kinds of state make up your application, and where each piece of state should live. Find a balance that works for you, and go with it.

Some common rules of thumb for determing what kind of data should be put into Redux:

• Do other parts of the application care about this data?
• Do you need to be able to create further derived data based on this original data?
• Is the same data being used to drive multiple components?
• Is there value to you in being able to restore this state to a given point in time (ie, time travel debugging)?
• Do you want to cache the data (ie, use what's in state if it's already there instead of re-requesting it)?

因此，如果您想在使用结果分派(dispatch)操作之前使用本地组件状态作为“临时数据”区域，这是可以的。