我在 Strapi 中有记录。我正在使用 Strapi 内容 API。在我的前端,我只需要随机显示 2 条记录。为了进行限制,我使用了内容 API 的限制查询。但随机获取我需要使用的关键字。官方文档没有提供任何有关此的详细信息 - https://strapi.io/documentation/v3.x/content-api/parameters.html#available-operators
随机没有官方的 Strapi API 参数。你必须实施你自己的。以下是我之前使用 Strapi v3 所做的事情:
1 - 制作服务功能
文件:
api/mymodel/services/mymodel.js
这将包含我们实际的随机查询(SQL),将其包装在服务中很方便,因为它可以在很多地方使用(cron 作业、其他模型内部等)。
module.exports = {
serviceGetRandom() {
return new Promise( (resolve, reject) => {
// There's a few ways to query data.
// This example uses Knex.
const knex = strapi.connections.default
let query = knex('mydatatable')
// Add more .select()'s if you want other fields
query.select('id')
// These rules enable us to get one random post
query.orderByRaw('RAND()')
query.limit(1)
// Initiate the query and do stuff
query
.then(record => {
console.log("getRandom() record: %O", record[0])
resolve(record[0])
})
.catch(error => {
reject(error)
})
})
}
}
2 - 在某个地方使用该服务,例如控制器:
文件:
api/mymodel/controllers/mymodel.js
module.exports = {
//(untested)
getRandom: async (ctx) => {
await strapi.services.mymodel.serviceGetRandom()
.then(output => {
console.log("getRandom output is %O", output.id)
ctx.send({
randomPost: output
}, 200)
})
.catch( () => {
ctx.send({
message: 'Oops! Some error message'
}, 204) // Place a proper error code here
})
}
}
3 - 创建一条指向此控制器的路由
文件:
api/mymodel/config/routes.json
...
{
"method": "GET",
"path": "/mymodelrandom",
"handler": "mymodel.getRandom",
"config": {
"policies": []
}
},
...
4 - 在您的前端中,访问路线
(无论您如何访问 API)
例如ajax 调用
/api/mymodelrandom
这似乎对我来说适用于 Strapi v.4 REST API
控制器,获取6个随机条目
"use strict";
/**
* artwork controller
*/
const { createCoreController } = require("@strapi/strapi").factories;
module.exports = createCoreController("api::artwork.artwork", ({ strapi }) => {
const numberOfEntries = 6;
return {
async random(ctx) {
const entries = await strapi.entityService.findMany(
"api::artwork.artwork",
{
populate: ["image", "pageHeading", "seo", "socialMedia", "artist"],
}
);
const randomEntries = [...entries].sort(() => 0.5 - Math.random());
ctx.body = randomEntries.slice(0, numberOfEntries);
},
};
});
路线 随机.js
"use strict";
module.exports = {
routes: [
{
method: "GET",
path: "/artwork/random",
handler: "artwork.random",
config: {
auth: false,
},
},
],
};
API
http://localhost:1337/api/artwork/random
匹配 Strapi 的默认数据结构
"use strict";
/**
* artwork controller
*/
const { createCoreController } = require("@strapi/strapi").factories;
module.exports = createCoreController("api::artwork.artwork", ({ strapi }) => {
const numberOfEntries = 6;
return {
async random(ctx) {
const entries = await strapi.entityService.findMany(
"api::artwork.artwork",
{
populate: ["image", "pageHeading", "seo", "socialMedia", "artist"],
}
);
const randomEntries = [...entries]
.sort(() => 0.5 - Math.random())
.slice(0, numberOfEntries);
const structureRandomEntries = {
data: randomEntries.map((entry) => {
return {
id: entry.id,
attributes: entry,
};
}),
};
ctx.body = structureRandomEntries;
},
};
});
还有一个随机排序插件。 https://www.npmjs.com/package/strapi-plugin-random-sort
没有用于获取随机结果的 API 参数。
所以:FrontEnd 是针对您的问题的推荐解决方案。
您需要创建一个随机请求范围,然后从该范围中获取一些随机项目。
function getRandomInt(max) {
return Math.floor(Math.random() * Math.floor(max));
}
const firstID = getRandomInt(restaurants.length);
const secondID = getRandomInt(3);
const query = qs.stringify({
id_in:[firstID,secondID ]
});
// request query should be something like GET /restaurants?id_in=3&id_in=6
可靠地做到这一点的一种方法是通过两个步骤:
_start
和 _limit
参数获取记录数// Untested code but you get the idea
// Returns a random number between min (inclusive) and max (exclusive)
function getRandomArbitrary(min, max) {
return Math.random() * (max - min) + min;
}
const { data: totalNumberPosts } = await axios.get('/posts/count');
// Fetch 20 posts
const _limit = 20;
// We need to be sure that we are not fetching less than 20 posts
// e.g. we only have 40 posts. We generate a random number that is 30.
// then we would start on 30 and would only fetch 10 posts (because we only have 40)
const _start = getRandomArbitrary(0, totalNumberPosts - _limit);
const { data: randomPosts } = await axios.get('/posts', { params: { _limit, _start } })
这种方法的问题在于它需要两次网络请求,但对于我的需求来说,这不是问题。
这似乎对我来说适用于 Strapi v4.3.8 和 graphql
src/index.js
"use strict";
module.exports = {
register({ strapi }) {
const extensionService = strapi.service("plugin::graphql.extension");
const extension = ({ strapi }) => ({
typeDefs: `
type Query {
randomTestimonial: Testimonial
}
`,
resolvers: {
Query: {
randomTestimonial: async (parent, args) => {
const entries = await strapi.entityService.findMany(
"api::testimonial.testimonial"
);
const sanitizedRandomEntry =
entries[Math.floor(Math.random() * entries.length)];
return sanitizedRandomEntry;
},
},
},
resolversConfig: {
"Query.randomTestimonial": {
auth: false,
},
},
});
extensionService.use(extension);
},
bootstrap({ strapi }) {},
};
graphql 查询:
query GetRandomTestimonial {
randomTestimonial {
__typename
name
position
location
description
}
}
生成有关路线更改/刷新的随机推荐 https://jungspooner.com/biography
使用
Postgres
和knex:
let { rows } = await strapi.db.connection.raw(
`select id from posts where published_at IS NOT null order by random() limit ${count};`
);