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@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

  lazy var persistentContainer: NSPersistentContainer = {
    let container = NSPersistentContainer(name: "DataModel")
      container.loadPersistentStores(completionHandler: { (storeDescription, error) in
          if let error = error as NSError? {
          fatalError("Unresolved error \(error), \(error.userInfo)")
          }
          })

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import React, { useRef, useState, useEffect } from "react";

const useForm = ({ initialValues, onSubmit }) => {
  const [values, setValues] = useState(initialValues || {});
  const [errors, setErrors] = useState({});
  const [touched, setTouched] = useState({});
  const [onSubmitting, setOnSubmitting] = useState(false);
  const [onBlur, setOnBlur] = useState(false);

  const formRendered = useRef(true);

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Bootstrap Icons Rails 6

Install: https://icons.getbootstrap.com/ As a font face

yarn add bootstrap-icons

Then update application.scss

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# post.cr
class Post	 
  YAML.mapping({
        name: String,
        description: String,
	 })
end

# factory.cr
module Factory

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/*
* Sample API with GET and POST endpoint.
* POST data is converted to string and saved in internal memory.
* GET endpoint returns all strings in an array.
 */
package main

import (
	"encoding/json"
	"flag"

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Testing RSpec Redirects & Flashes

See: https://medium.com/@danahartweg/testing-flash-messages-on-redirect-with-rspec-b64c639c3715

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    # Generate a response array consistent with the requirements of the SPEC.
    # @return [Array] a 3-tuple suitable of `[status, headers, body]`
    # which is suitable to be returned from the middleware `#call(env)` method.
    def finish(&block)
      if STATUS_WITH_NO_ENTITY_BODY[status.to_i]
        delete_header CONTENT_TYPE
        delete_header CONTENT_LENGTH
        close
        return [@status, @headers, []]
      else

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Adding Twitter Bootstrap to Rails 6

See also: https://blog.robsdomain.com/twitter-bootstrap-in-rails-6/

Rails 6 mades large changes to how asset compilation is done. In specific sprockets has been removed for javascript processing and replaced with the common webpack utility. Sprockets remains in usage for CSS processing.

When it comes to asset bundling, the "Rails way" is webpack for JavaScript and Sprockets for everything else. The default setup in a fresh Rail 6 install, similar to what Basecamp uses, still compiles CSS, images, and fonts with Sprockets.

This means, if you're a member of the Basecamp camp, all your webpack JavaScript source files would live in app/javascript and all your Sprockets CSS and images would remain in app/assets. Running rails assets:precompile will first build all the Sprockets assets into the public/assets directory, then will build all the webpack assets into the public/packs directory.

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CircleCI Configs

Configuration files for CircleCI

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Software	Version	What Is It?
Node Version Manager (nvm)	latest	A Node.js version management software
Node.js	v10.11.0	An open source Javascript runtime.
Yarn	latest	A node package manager tool
Vue CLI	3.10.0	Vue JS command line interface for serving and generating applications