Ramda：如何使用嵌套对象过滤数据？

Question

const articles = [
    {title: 'title 1', published: false, pages: 30, tags: {name: 'work', id: 1, visibility: "everyone"}},
    {title: 'title 2', published: false, pages: 25, tags: {name: 'home', id: 3, visibility: "myself"}},
    {title: 'title 3', published: true, pages: 30, tags: {name: 'vacation', id: 5, visibility: "myself"}}
];

我的 JSON 数据看起来像这样，我需要根据 published 为真且 visibility 为我自己的值进行过滤。我怎样才能有效地实现这一目标？对此有任何帮助将不胜感激。

到目前为止，我只能使用单个属性进行过滤

  R.filter(R.propEq("published", false))(articles);

Answer 1

像这样：

R.filter(
  R.allPass([
    R.propEq("published", false),
    R.pathEq(["tags", "visibility"], "myself")
  ])
)(articles);

Answer 2

您可以使用规范对象：

const predicate = R.where({
  published: R.equals(true),
  tags: R.where({
    visibility: R.equals('myself'),
  }),
});


// ==

const data = [
  {title: 'title 1', published: false, pages: 30, tags: {name: 'work', id: 1, visibility: "everyone"}},
  {title: 'title 2', published: false, pages: 25, tags: {name: 'home', id: 3, visibility: "myself"}},
  {title: 'title 3', published: true, pages: 30, tags: {name: 'vacation', id: 5, visibility: "myself"}}
];

console.log(
  R.filter(predicate, data),
);

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Ramda：如何使用嵌套对象过滤数据？

Ramda: How can I filter data with nested objects?

javascript

ramda.js