如何将2点符号字符串合并到GraphQL查询字符串 [英] How can I merge 2 dot notation strings to a GraphQL query string
问题描述
我正在尝试仅使用javascript(可以是ES6/打字稿)将2个点表示法字符串合并到GrahQL查询中.
I'm trying to merge 2 dot notation strings into a GrahQL query with only javascript (it can be ES6/typescript).
例如,假设我有一个字符串数组
For example, let say that I have an array of strings
[
'firstName',
'lastName',
'billing.address.street',
'billing.address.zip',
'shipping.address.street',
'shipping.address.zip'
]
预期的查询字符串输出为(空格不重要)
The expected query string output would be (white spaces are not important)
firstName, lastName, shipping{address{street, zip}}, billing{address{street, zip }}
我可以将点表示法按1转换为查询字符串,但是如何将所有这些符号合并在一起?我有一个使用street.name
并输出street { name }
的函数.所以这个功能可以做到
I can convert 1 by 1 the dot notation to a query string, but how do I merge all of that together? I got a function that take street.name
and output street { name }
. So this function would do it
convertToString(inputString) {
let result = '';
if (inputString.indexOf('.') === -1) {
result = inputString;
} else {
const inputArray = inputString.split('.');
for (let i = inputArray.length - 1; i >= 0; i--) {
if (i === 0) {
result = inputArray[i] + result;
} else {
result = '{' + inputArray[i] + result + '}';
}
}
}
return result;
}
console.log(convertToString('address.street')); // address { street }
但是接下来,我将如何遍历所有字符串并仅获得1个将相同属性组合为一组的GraphQL查询字符串.主要问题是如何合并2个点表示法字符串而不丢失任何内容且没有重复项(此时,我可以得到此address { name } address { zip }
,但是当它在GraphQL服务器上运行时,仅保留后者,因此仅保留zip
出现在结果中.
But then how would I loop through all strings and get only 1 GraphQL query string that combines the same properties into a group. The main issue is how do I merge the 2 dot notation strings without losing anything and without having duplicates (at this point, I can get this address { name } address { zip }
but when this runs on the GraphQL server, only the latter is kept and so only the zip
shows up in the result.
我尝试创建代表该结构的临时对象,但效果并不理想.
I tried creating temporary object that represent the structure, but that didn't work out so good.
推荐答案
修订后的答案
根据您修改后的问题和要求,以下是修改后的答案.这将从嵌套的点表示法递归地构建一个对象,然后利用JSON.stringify
来构建查询字符串(通过一些字符串操作);
Based on your revised question and requirements, here's a revised answer. This will recursively build an object from nested dot notations, and then leverage JSON.stringify
to build the query string (with some string manipulations);
function buildQuery(...args) {
const set = (o = {}, a) => {
const k = a.shift();
o[k] = a.length ? set(o[k], a) : null;
return o;
}
const o = args.reduce((o, a) => set(o, a.split('.')), {});
return JSON.stringify(o)
.replace(/\"|\:|null/g, '')
.replace(/^\{/, '')
.replace(/\}$/, '');
}
const query = buildQuery(
'firstName',
'lastName',
'billing.address.street',
'billing.address.zip',
'shipping.address.street',
'shipping.address.zip'
);
console.log(query);
原始答案
我建议先将各个点符号字符串转换为对象,然后再将该对象转换为字符串.
I would suggest converting the individual dot notation strings into an object first, and then converting the object to a string.
function buildQuery(...args) {
let q = {};
args.forEach((arg) => {
const [ o, a ] = arg.split('.');
q[o] = q[o] || [];
if (a) q[o] = q[o].concat(a);
});
return Object.keys(q).map((k) => {
return q[k].length ? `${k} \{ ${q[k].join(', ')} \}` : k;
}).join(', ');
}
const query = buildQuery('person.name', 'person.email', 'street.name', 'street.zip');
console.log(query);
// "person { name, email }, street { name, zip }"
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