在我的 gatsby 项目中，我gatsby-node.js导出了两个 Bound Action Creator：onCreateNode 和 createPages。通常这些运行正常 - 当 onCreateNode 运行时，我使用一些现有节点来创建我想要的节点，然后 createPages 使用其中一些节点来创建页面。
但是，有时gatsby develop在终端运行时，我得到：
GraphQLError: Cannot query field "allBusiness" on type "RootQueryType". Did you mean "allBusinessesJson"?
和
TypeError: Cannot read property 'published_issues' of undefined
allBusiness是在 createNode 中创建的节点，并且published_issues是使用 allMarkdownRemark 进行查询的 graphql 别名（请参阅下面的完整代码）。
然而，经常gatsby-node.js稍微改变代码（例如添加控制台日志）将解决问题并且项目将正确构建。尽管我已经接近生产并且显然在 Netlify 中的计划构建（例如）并不总是有效，但这工作正常。
我无法确定 createPages Bound Action Creator 是异步的，而 onCreateNode 不是这样的问题。
gatsby-node.js代码：
const path = require('path');
const fs = require('fs');
const slugCreator = require('slug');
const rp = require('request-promise');
const jsonWriter = require('./gatsby-node-json-writer');
const dropRight = require('lodash/dropRight');
exports.onCreateNode = ({ node, boundActionCreators, getNode }) => {
const { createNodeField, createNode } = boundActionCreators;
const pathRegEx = /\/local-business-directory\//;
let slug;
// if(node.internal.type==='MarkdownRemark' && pathRegEx.test(node.id)){
// jsonWriter(node);
// }
if (node.internal.type === `AllDataJson`) {
//place jsonWriter (with parameter of'node') here
const { businesses } = node;
businesses.forEach((business) => {
business.id = slugCreator(business.company_name, { lower: true });
business.parent = " ";
business.children = [];
business.internal = {};
business.internal.contentDigest = business.company_name;
business.internal.type = "Business";
business.image = `${business.image}`;
createNode(
business
)
})
}
if (node.internal.type === `MarkdownRemark`) {
const fileNode = getNode(node.parent);
const parsedFilePath = path.parse(fileNode.relativePath);
if (parsedFilePath.name !== `index` && parsedFilePath.dir !== ``) {
slug = `/${parsedFilePath.dir}/${parsedFilePath.name}/`
} else if (parsedFilePath.dir === ``) {
slug = `/${parsedFilePath.name}/`
} else {
slug = `/${parsedFilePath.dir}/`
}
// Add slug as a field on the node.
createNodeField({ node, name: `slug`, value: slug })
}
if (node.internal.type === "Business") {
const nodeName = node.company_name;
const slug = `/local-business-directory/${slugCreator(nodeName, { lower: true })}`;
// Add slug as a field on the node.
createNodeField({ node, name: `slug`, value: slug })
}
}
;
exports.createPages = ({ graphql, boundActionCreators }) => {
const { createPage } = boundActionCreators;
return new Promise((resolve, reject) => {
const publishedIssuePage = path.resolve("src/templates/published-issue.js");
const advertiserPage = path.resolve("src/templates/advertiser/index.js");
// Query for all markdown "nodes" and for the slug we previously created.
resolve(
graphql(
`
{
advertisers: allBusiness {
edges {
node {
id
image
fields {
slug
}
}
}
}
published_issues: allMarkdownRemark(filter: {fileAbsolutePath: {regex: "/published-issues/"}}) {
edges {
node {
id
fields {
slug
}
frontmatter {
imageURL
}
}
}
}
}
`
).then(result => {
if (result.errors) {
console.log(result.errors);
reject(result.errors)
}
// Create blog posts pages.
result.data.published_issues.edges.forEach(edge => {
const imageURLRegex = `/${edge.node.frontmatter.imageURL}/g`;
createPage({
path: edge.node.fields.slug, // required
component: publishedIssuePage,
context: {
slug: edge.node.fields.slug,
imageURLRegex,
},
})
});
result.data.advertisers.edges.forEach(edge => {
const imageURLRegex = `/${edge.node.image}/`;
console.log(imageURLRegex);
createPage({
path: edge.node.fields.slug, // required
co mponent: advertiserPage,
context: {
slug: edge.node.fields.slug,
imageURLRegex
},
})
});
resolve();
})
)
})
};
并构建日志：
[ { GraphQLError: Cannot query field "allBusiness" on type "RootQueryType". Did you mean "allBusinessesJson"?
at Object.Field (/Users/Gridley123/bin/stiveslocal/node_modules/graphql/validation/rules/FieldsOnCorrectType.js:65:31)
at Object.enter (/Users/Gridley123/bin/stiveslocal/node_modules/graphql/language/visitor.js:295:29)
at Object.enter (/Users/Gridley123/bin/stiveslocal/node_modules/graphql/language/visitor.js:337:25)
at visit (/Users/Gridley123/bin/stiveslocal/node_modules/graphql/language/visitor.js:227:26)
at visitUsingRules (/Users/Gridley123/bin/stiveslocal/node_modules/graphql/validation/validate.js:75:22)
at validate (/Users/Gridley123/bin/stiveslocal/node_modules/graphql/validation/validate.js:60:10)
at /Users/Gridley123/bin/stiveslocal/node_modules/graphql/graphql.js:69:51
at Promise._execute (/usr/local/lib/node_modules/gatsby/node_modules/bluebird/js/release/debuggability.js:303:9)
at Promise._resolveFromExecutor (/usr/local/lib/node_modules/gatsby/node_modules/bluebird/js/release/promise.js:483:18)
at new Promise (/usr/local/lib/node_modules/gatsby/node_modules/bluebird/js/release/promise.js:79:10)
at graphqlImpl (/Users/Gridley123/bin/stiveslocal/node_modules/graphql/graphql.js:59:10)
at graphql (/Users/Gridley123/bin/stiveslocal/node_modules/graphql/graphql.js:48:227)
at graphqlRunner (/Users/Gridley123/bin/stiveslocal/node_modules/gatsby/dist/bootstrap/index.js:368:22)
at Promise (/Users/Gridley123/bin/stiveslocal/gatsby-node.js:127:7)
at Promise._execute (/usr/local/lib/node_modules/gatsby/node_modules/bluebird/js/release/debuggability.js:303:9)
at Promise._resolveFromExecutor (/usr/local/lib/node_modules/gatsby/node_modules/bluebird/js/release/promise.js:483:18)
at new Promise (/usr/local/lib/node_modules/gatsby/node_modules/bluebird/js/release/promise.js:79:10)
at Object.exports.createPages (/Users/Gridley123/bin/stiveslocal/gatsby-node.js:122:10)
at runAPI (/Users/Gridley123/bin/stiveslocal/node_modules/gatsby/dist/utils/api-runner-node.js:104:36)
at /Users/Gridley123/bin/stiveslocal/node_modules/gatsby/dist/utils/api-runner-node.js:178:33
at /Users/Gridley123/bin/stiveslocal/node_modules/async/internal/map.js:27:9
at replenish (/Users/Gridley123/bin/stiveslocal/node_modules/async/internal/eachOfLimit.js:64:17)
at iterateeCallback (/Users/Gridley123/bin/stiveslocal/node_modules/async/internal/eachOfLimit.js:49:17)
at /Users/Gridley123/bin/stiveslocal/node_modules/async/internal/onlyOnce.js:12:16
at /Users/Gridley123/bin/stiveslocal/node_modules/async/internal/map.js:29:13
at tryCatcher (/Users/Gridley123/bin/stiveslocal/node_modules/bluebird/js/release/util.js:16:23)
at Promise.successAdapter (/Users/Gridley123/bin/stiveslocal/node_modules/bluebird/js/release/nodeify.js:23:30)
at Promise._settlePromise (/Users/Gridley123/bin/stiveslocal/node_modules/bluebird/js/release/promise.js:566:21)
message: 'Cannot query field "allBusiness" on type "RootQueryType". Did you mean "allBusinessesJson"?',
locations: [ [Object] ],
path: undefined } ]
error Plugin default-site-plugin returned an error
TypeError: Cannot read property 'published_issues' of undefined
- gatsby-node.js:163 graphql.then.result
/Users/Gridley123/bin/stiveslocal/gatsby-node.js:163:20
- util.js:16 tryCatcher
[lib]/[gatsby]/[bluebird]/js/release/util.js:16:23
- promise.js:512 Promise._settlePromiseFromHandler
[lib]/[gatsby]/[bluebird]/js/release/promise.js:512:31
- promise.js:569 Promise._settlePromise
[lib]/[gatsby]/[bluebird]/js/release/promise.js:569:18
- promise.js:606 Promise._settlePromiseCtx
[lib]/[gatsby]/[bluebird]/js/release/promise.js:606:10
- async.js:138 Async._drainQueue
[lib]/[gatsby]/[bluebird]/js/release/async.js:138:12
- async.js:143 Async._drainQueues
[lib]/[gatsby]/[bluebird]/js/release/async.js:143:10
- async.js:17 Immediate.Async.drainQueues
[lib]/[gatsby]/[bluebird]/js/release/async.js:17:14