Question

创建计算字段并立即以表格形式显示的最佳做法是什么？

示例：

import * as React from 'react';

class Clock extends React.Component {
  constructor(props) {
      super(props);
      this.state = {
          date: new Date()
      }
  }

  componentDidMount() {
      this.props.handleTime(this.state.date);
  }

  render() {
      return <View>{this.state.date.toString()}</View>;
  }
}

当我为测试模式添加新记录时，我想在Extra_price字段中显示评估值export class Home extends Component { displayName = Home.name state = { time: null }; handleTime = (timeValue) => this.setState(currentState => ({ time: timeValue }) ); render() { return ( <div> <div> <Clock time={this.handleTime} /> </div> </div> ); } }。

我该怎么办？

谢谢

Answer 1

一种简单而优雅的解决方案是在模型中定义一个property()并在模型管理员中使用

class User(models.Model):
    id = models.AutoField(db_column='Id', primary_key=True)  # Field name made lowercase.
    price = models.IntegerField(db_column='Price')
    extra_field = models.DecimalField(db_column='extra_field')

    @property
    def my_logic(self):
        return self.price * 123456 # return whatever you want


@register(Test)
class TestAdmin(admin.ModelAdmin):
    readonly_fields = ['my_logic']

django立即计算字段

1 个答案: