AloofBuddha

Sequelize Relationships: hasOne vs belongsTo

Docs

• Docs Source
• belongsTo API
• hasOne API

Intro

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const initialState = {
    activeIndex: null,
    flights: []
}

export default function reducer (state = initialState, action){
  switch(action.type) {
    // lets create first. 
    // This means we create a flight then add it to a *copy* of the list.
    case CREATE_NEW_FLIGHT:

AloofBuddha

// ES6 of the week: arrow functions and lexical scope

// https://github.com/lukehoban/es6features

// arrow functions are a shorthand for function syntax,
// which make them a lot more succint for functions that take functions
// (i.e. 'higher order functions')

var evens = [2,4,6,8,10];

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// Product Model definition, called 'product' and associated with table 'products'
var Product = this.sequelize.define('product', {
  title: Sequelize.STRING
});

// User Model definition, called 'user' and associated with table 'users'
var User = this.sequelize.define('user', {
  first_name: Sequelize.STRING,
  last_name: Sequelize.STRING
});

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Note: $> means command line input

Dependencies

Dependencies to use Sequelize $> npm install --save sequelize pg pg-hstore

Setup

Must create the DB first $> createdb my-music

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var http = require('http');
    url  = require('url');

var database = {}; // will need to read from file here

var setRegex = /^\/set\?.+=.+$/,  // /set?somekey=somevalue
    getRegex = /^\/get\?key=.+$/; // /get?key=somekey

http.createServer(requestListener).listen(4000);

AloofBuddha

# we want to match data, not a Node, as search 
# shouldn't require any Node creation either

def search(self, data):
    node = self.head
    while node:
    	if node.data == data:
        	return node
    	else:
        	node = node.nextNode

AloofBuddha

import Data.List (inits, tails)

main :: IO ()
main = do
    print $ perms [1..4]
    print $ perms' "abcd"
    print $ perms'' [Nothing, Just 1, Just 2, Just 3]

perms, perms', perms'' :: [a] -> [[a]]