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[英]GraphQL query - how to reuse inline fragments field on different types
[英]How to map graphql query which is using union and fragments to render on page
架構:
type Link {
items: [itemapi]
}
type itemapi {
id: ID!
name: String!
custom_attributes: [CUSTOM_ATTRIBUTES]
}
union CUSTOM_ATTRIBUTES = CustomString | CustomArray
type CustomString {
attribute_code: String
value: String
}
type CustomArray {
attribute_code: String
value: [String]
}
type Query {
allLinks: Link!
}
`;
功能:
const itemList= ({ data: {loading, error, allLinks }}) => {
if (loading) {
return <p>Loading ...</p>;
}
if (error) {
return <p>{error.message}</p>;
}
return (
<div className="itemList">
{ allLinks.items.map( aL => <div key={aL.id} className="items">{aL.???}</div> ) }
</div>
);
};
const channelsListQuery = gql`
query ChannelsListQuery {
allLinks {
items {
id
custom_attributes {
... on CustomString{
value
}
... on CustomArray{
aliasVar: value
}
}
}
}
}
`;
問題是,我不知道如何正確地映射它。 我在架構中使用union,在查詢中使用片段以獲取所需信息,然后在頁面上呈現它。 據我所知,查詢數據是通過props傳遞的,那么我如何才能訪問聯合/片段中的props,以及如果可能的話,查詢中具有別名(如CustomArray
value
props? 因為其中一個value
是String,第二個是字符串數組,但是具有相同的name( value
),所以我需要將其映射並放入其中一個別名以從api獲取數據。 我需要在地圖功能中使用地圖嗎?
{"items":[{"id":"1","custom_attributes":[{"__typename":"CustomString","value":"<p>The sporty Joust Duffle Bag can't be beat - not in the gym, not on the luggage carousel, not anywhere. Big enough to haul a basketball or soccer ball and some sneakers with plenty of room to spare, it's ideal for athletes with places to go.<p>\r\n<ul>\r\n<li>Dual top handles.</li>\r\n<li>Adjustable shoulder strap.</li>\r\n<li>Full-length zipper.</li>\r\n<li>L 29\" x W 13\" x H 11\".</li>\r\n</ul>"},{"__typename":"CustomString","value":"/m/b/mb01-blue-0.jpg"},{"__typename":"CustomString","value":"/m/b/mb01-blue-0.jpg"},{"__typename":"CustomString","value":"/m/b/mb01-blue-0.jpg"},{"__typename":"CustomString","value":"49"},{"__typename":"CustomArray"},{"__typename":"CustomString","value":"container1"},{"__typename":"CustomString","value":"0"},{"__typename":"CustomString","value":"0"},{"__typename":"CustomString","value":"0"},{"__typename":"CustomString","value":"joust-duffle-bag"},{"__typename":"CustomString","value":"0"},{"__typename":"CustomString","value":"0"},{"__typename":"CustomString","value":"0"},{"__typename":"CustomString","value":"0"},{"__typename":"CustomString","value":"0"},{"__typename":"CustomString","value":"0"},{"__typename":"CustomString","value":"0"},{"__typename":"CustomString","value":"no_selection"}],"__typename":"itemapi"},{"id":"2","custom_attributes":[{"__typename":"CustomString","value":"<p>The sporty Joust blablablablablablablablablbalbalblalbalbla not on the luggage carousel, not anywhere. Big enough to haul a basketball or soccer ball and some sneakers with plenty of room to spare, it's ideal for athletes with places to go.<p>\r\n<ul>\r\n<li>Dual top handles.</li>\r\n<li>Adjustable shoulder strap.</li>\r\n<li>Full-length zipper.</li>\r\n<li>L 29\" x W 13\" x H 11\".</li>\r\n</ul>"},{"__typename":"CustomString","value":"/m/b/mb01-blue-0.jpg"},{"__typename":"CustomString","value":"/m/b/mb01-blue-0.jpg"},{"__typename":"CustomString","value":"/m/b/mb01-blue-0.jpg"},{"__typename":"CustomString","value":"49"},{"__typename":"CustomArray"},{"__typename":"CustomString","value":"container1"},{"__typename":"CustomString","value":"0"},{"__typename":"CustomString","value":"0"},{"__typename":"CustomString","value":"0"},{"__typename":"CustomString","value":"joust-duffle-bag"},{"__typename":"CustomString","value":"0"},{"__typename":"CustomString","value":"0"},{"__typename":"CustomString","value":"0"},{"__typename":"CustomString","value":"0"},{"__typename":"CustomString","value":"0"},{"__typename":"CustomString","value":"0"},{"__typename":"CustomString","value":"0"},{"__typename":"CustomString","value":"no_selection"}],"__typename":"itemapi"}],"__typename":"Link"}
您可以修改查詢以包含__typename
。 假設custom_attributes
是一個對象:
query ChannelsListQuery {
allLinks {
items {
id
custom_attributes {
__typename
... on CustomString{
value
}
... on CustomArray{
aliasVar: value
}
}
}
}
}
Then inside your render function you can do something like this:
return (
<div className="itemList">
{
allLinks.items.map(item =>
<div key={item.id} className="items">
{
item.__typename === 'CustomString'
? <div>{item.custom_attributes.value}</div>
: item.custom_attributes.aliasVar.map(v => <div key={v}>{v}</div>)
}
</div>
)
}
</div>
);
另外, __typename
,您還可以檢查是否存在aliasVar
屬性並相應地進行渲染,但是類型名是了解正在使用的數據形狀的一種可預測的方式。
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