wayne5540

defmodule Validator do
  def validate_age(age) do
    cond do
      age < 18 -> "Under 18"
      age < 21 -> "Under 21"
      true -> "Adult"
    end
  end
end

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[iOS - Swift] How to communicate with iFrames inside WebView

To provide better shopping experience for Onefill users, we want to support as many shopping site as we can by injecting our JavaScript engine into those sites. However, some of them are using iframe which is outdated HTML tag to implement some forms like payment and signup. And due to security issue JavaScript can’t communicate with iframe unless it’s same domain or it’s your domain. So here is the approach we did to support iframe under iOS web view and so we can communicate with it.

• Xcode: Version 8.2.1 (8C1002)
• Swift: Apple Swift version 3.0.2 (swiftlang-800.0.63 clang-800.0.42.1)

Conclusion first

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Dump DB Script, run under command line:
pg_dump -U postgres -Fc db_name > dbbackup.dump

Notes:

if zsh: command not found: pg_dump happened
add PATH="/Applications/Postgres.app/Contents/MacOS/bin:$PATH" to ~/.bash_profile

Resources:

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Validate JSON schema in Rails

Topics

1. What/Why JSON schema
2. Apply to rails model validation
3. Test your API endpoint with schema matcher
4. Homework for a curious reader
5. References

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Building a GraphQL API in Rails - Part 1

This is a series blog post cover above three topics of GraphQL:

1. About GraphQL
2. Building a basic API with Rails
3. Some best practices

GraphQL is not a new thing, it already exist for a while, the reason I decide to investigate it is because Github released their GraphQL API alpha currently. We know Github has been a very good company for a long time, their RESTful API also becomes some kind of standard for developers, so it's pretty interesting to see what’s new they've been released.

wayne5540

# Building a GraphQL API in Rails - Part 3 - Best Practice

This is a series blog post cover above three topics of GraphQL:

1. About GraphQL
2. Building a basic API with Rails
3. Some best practices

GraphQL is not a new thing, it already exist for a while, the reason I decide to investigate it is because Github released their GraphQL API alpha currently. We know Github has been a very good company for a long time, their RESTful API also becomes some kind of standard for developers, so it’s pretty interesting to see what’s new they’ve been released.

wayne5540

Building a GraphQL API in Rails - Part 2 - Start Coding

This is a series blog post cover above three topics of GraphQL:

1. About GraphQL
2. Building a basic API with Rails
3. Some best practices

GraphQL is not a new thing, it already exist for a while, the reason I decide to investigate it is because Github released their GraphQL API alpha currently. We know Github has been a very good company for a long time, their RESTful API also becomes some kind of standard for developers, so it’s pretty interesting to see what’s new they’ve been released.

wayne5540

import UIKit
import WebKit

class ViewController: UIViewController, WKUIDelegate, WKNavigationDelegate, WKScriptMessageHandler {
    var webView: WKWebView!

    override func loadView() {
        let webConfiguration = WKWebViewConfiguration()
        let contentController = WKUserContentController()
        // Inject JavaScript which sending message to App

wayne5540

import UIKit
import WebKit

class ViewController: UIViewController, WKUIDelegate, WKNavigationDelegate {
    var webView: WKWebView!
    
    override func loadView() {
        let webConfiguration = WKWebViewConfiguration()
        let contentController = WKUserContentController()
        let js: String = "var h1s = document.querySelectorAll('h1'); for (var i = 0; i < h1s.length; i++) { h1s[i].style.color = 'red' };"