@graphql-tools/batch-execute
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A set of utils for faster development of GraphQL tools
46 lines (45 loc) • 1.73 kB
JavaScript
// adapted from https://github.com/gatsbyjs/gatsby/blob/master/packages/gatsby-source-graphql/src/batching/merge-queries.js
import { createGraphQLError, relocatedError } from '@graphql-tools/utils';
import { parseKey } from './prefix.js';
/**
* Split and transform result of the query produced by the `merge` function
*/
export function splitResult({ data, errors }, numResults) {
const splitResults = [];
for (let i = 0; i < numResults; i++) {
splitResults.push({});
}
if (data) {
for (const prefixedKey in data) {
const { index, originalKey } = parseKey(prefixedKey);
const result = splitResults[index];
if (result == null) {
continue;
}
if (result.data == null) {
result.data = { [originalKey]: data[prefixedKey] };
}
else {
result.data[originalKey] = data[prefixedKey];
}
}
}
if (errors) {
for (const error of errors) {
if (error.path) {
const parsedKey = parseKey(error.path[0]);
const { index, originalKey } = parsedKey;
const newError = relocatedError(error, [originalKey, ...error.path.slice(1)]);
const resultErrors = (splitResults[index].errors = (splitResults[index].errors || []));
resultErrors.push(newError);
}
else {
splitResults.forEach(result => {
const resultErrors = (result.errors = (result.errors || []));
resultErrors.push(createGraphQLError(error.message));
});
}
}
}
return splitResults;
}