我在 React Native 环境中度过了一段糟糕的时光。在我一直工作的小初创公司从主分支拉取后，我无法开始npx react-native run-ios工作。我已经尝试了所有常见的嫌疑人，例如：
1. reinstall node modules from package.json
2. reinstall pod in /ios
3. reinstall cocoapods
4. made sure to clear all caches
5. tried different versions of Node
6. reinstalled Node, NVM, Xcode, Cocoapods from the React-Native docs
7. made sure I have a .env file
8. restarted my computer (you'd be surprised)
我得到的错误是：
Error: EISDIR: illegal operation on a directory, read
at Object.readSync (fs.js:498:3)
at tryReadSync (fs.js:332:20)
at Object.readFileSync (fs.js:369:19)
at UnableToResolveError.buildCodeFrameMessage …我正在尝试实现一个相当复杂的表单，其中包含日期选择器和输入，用户可以添加多个（或删除）。然后，该数据将在提交时添加到整个表单中。我如何让react-hook-forms在真实表单中注册那个小动态人造表单？
这是人造表单输入：
<AddPackagesStyle>
<Label htmlFor="addedPackages" label="Add Packages" />
<DatePicker
id="dateRange"
selected={startDate}
selectsRange
startDate={startDate}
endDate={endDate}
placeholderText="select dates"
onChange={onDateChange}
/>
<PackageInput
id="PackageSelect"
placeholder="Select Package"
type="text"
value={name}
// @ts-ignore
onChange={(e) =>
// @ts-ignore
setName(e.target.value)
}
/>
<ButtonContainer>
<button type="button" onClick={clearAll}>
Clear
</button>
<button
type="button"
// @ts-ignore
onClick={addPackage}
>
Add
</button>
</ButtonContainer>
</AddPackagesStyle>
这些条目被添加到 useState 挂钩中的数组中：
const [addedPackages, setAddedPackages] = useState<any[]>([])
然后这会在 JSX 中呈现为添加包：
<ContentSubscriptionWrapper>
{addedPackages.length !== 0 &&
addedPackages.map((addedPackage, idx) => (
// @ts-ignore
<>
<ContentSubscriptionColumn>
{addedPackage.name && addedPackage.name}
</ContentSubscriptionColumn>
<ContentSubscriptionColumn>
{addedPackage.startDate && …我已经构建了一个 Rails 6 应用程序，它使用 React 作为前端并使用 Bootstrap React 作为我的样式组件。在本地一切正常，但是当我部署到 Heroku 并尝试创建“中断”时，它会引发以下错误：
Modal.js:21 Uncaught TypeError: Cannot convert undefined or null to object
at hasOwnProperty (<anonymous>)
at Modal.js:21
at Array.forEach (<anonymous>)
at Modal.js:20
at t.n.render (Modal.js:302)
at Qi (react-dom.production.min.js:4243)
at Ji (react-dom.production.min.js:4234)
at wc (react-dom.production.min.js:6676)
at yu (react-dom.production.min.js:5650)
at Mu (react-dom.production.min.js:5639)
同样，<Modal>本地打开正常。无需动手动扳手模块本身，是否有更简单的解决方法或解决方案？
这是我的父组件：
import React, { Component } from "react";
import RecurringOutageComponent from "./components/RecurringOutageComponent";
import FutureOutageComponent from "./components/FutureOutageComponent";
import CurrentOutagesComponent from "./components/CurrentOutagesComponent";
import CreateModalComponent from "./components/CreateModalComponent";
import { Container, Row, …我正在尝试在嵌套嵌套数组的迭代中向下钻取每个值，并用nil“ None”或0之类的值替换所有值。请查看我的代码显然不起作用。我需要先解决此问题，然后再将其传递给Rails视图进行迭代和渲染：
我的控制器：
def show
results = Record.get_record(params[:trans_uuid])
if !results.empty?
record = results.map { |res| res.attributes.symbolize_keys }
@record = Record.replace_nil(record) # this calls method in Model
else
flash[:error] = 'No record found'
end
end
我的模特：
def self.replace_nil(record)
record.each do |r|
r.values == nil ? "None" : r.values
end
end
record传递给Model方法时self.replace_nil(record如下所示：
[{:id=>1, :time_inserted=>Wed, 03 Apr 2019 15:41:06 UTC +00:00, :time_modified=>nil, :request_state=>"NY", :trans_uuid=>"fe27813c-561c-11e9-9284-0282b642e944", :sent_to_state=>-1, :completed=>-1, :record_found=>-1, :retry_flag=>-1, :chargeable=>-1, :note=>"", :bridge_resultcode=>"xxxx", :bridge_charges=>-1}]
我正在尝试迭代在 React 组件内的 props 中传递的 javascript Set() 。在迭代到位的情况下，我无法在屏幕上渲染任何内容：
{selectedCity.forEach((key, value) => (
return (
<Row>
<Col sm={12} md={6} mdOffset={4} lgOffset={4}>
<Typography className="hide-mobile" h3>
TICKET PRICE FOR IN-STATE:
</Typography>
<Typography h3>{value.name}</Typography>
<TicketPriceInput
onChange={e => {
setConcertDetails('price', e.target.value);
detectInputChange(e);
}}
value={price}
name="price"
isPriceChanged={isPriceChanged}
/>
<OutPriceLabel className="hide-mobile">
<Typography h3>TICKET PRICE FOR OUT-OF-STATE:</Typography>
<Typography h3 bold className="hide-mobile">
{outLocationPrice()}
</Typography>
</OutPriceLabel>
<FootNote>
<Typography medium spaced className="hide-mobile">
*After the first 20 tickets anyone located in-state can
purchase tickets at the regular ticket price you set.
</Typography> …