原因组件

Question

借用Yawar的所有帮助answer，我有以下内容：

$cat src/index.re 
let products = [|
  {name: "Football", price: 49.99},
  {name: "Basebll", price: 1.99},
  {name: "Poker", price: 33.99}
|];

ReactDOMRe.renderToElementWithId(
    <ProductTable products />
);

$cat src/productRow.re
let component = ReasonReact.statelessComponent("ProductRow");

let echo = ReasonReact.stringToElement;

let make = (~name: string, ~price: float, _) => {
 ...component,
 render: (_) => {
    <tr>
     <td>{echo(name)}</td>
     <td>{price |> string_of_float |> echo}</td>
    </tr>
 }
};
$cat src/ProductTable.re
let component = ReasonReact.statelessComponent("ProductTable");

let echo = ReasonReact.stringToElement;

let make = (~products, _) => {
    ...component,
    render: (_) => {
      let productRows = products
        |> Array.map(({name, price}) => <ProductRow key=name name price />)
        |> ReasonReact.arrayToElement;

      <table>
        <thead>
          <tr>
            <th>{echo("Name")}</th>
            <th>{echo("Price")}</th>
          </tr>
        </thead>
        <tbody>productRows</tbody>
      </table>
    }
}

我收到以下编译时错误：

   7 ┆ render: (_) => {
   8 ┆   let productRows = products
   9 ┆     |> Array.map(({name, price}) => <ProductRow key=name name price />
       )
  10 ┆     |> ReasonReact.arrayToElement;
  11 ┆ 

  Unbound record field name

如何修复此编译时错误？

Answer 1

Reason编译器会为你推断出很多类型，但是对于记录，你必须首先声明它具有哪些字段（及其类型）。

从@ yawar的有用答案中提取，您只需要在文件顶部包含类型定义：

type product = {name: string, price: float};

通过这种方式，编译器将能够告诉products类型为array(product)，并且应该从那里继续愉快地继续。试一试here