Continued working on the Local Library project. I got the opportunity to review the docs on using the mongo shell to check my database. I choose to use a local installation of the database instead of Atlas because I thought it would be faster. So far it has turned out to be that way since. Anyways, I went through the section on populating the database with some sample data. Thankfully, all of my code ran successfully with only one error that was easy to fix. I now have some data in the Local Library database and can work on building out the rest of the app with databases queries based on get requests.
TLDR;
Okay, so here are the highlights of what I did:
- MongoDB -> Reviewed the docs on shell syntax. How to insert documents, how to query documents, etc. It is pretty straight-forward thankfully. I enjoyed going over the docs.
- Practice -> Continued working through the practice ‘Local Library’ project in the MDN ExpressJS guide. I finished writing out the models and I populated the database using the script they provided in the tutorial. I wonder if the tutorial is old since the use of
varinstead ofconstin the variable bindings is present. To each is there own but it is becoming something I see far less as time goes on.
Database population Script
#! /usr/bin/env node
console.log('This script populates some test books, authors, genres and bookinstances to your database. Specified database as argument - e.g.: populatedb mongodb+srv://cooluser:coolpassword@cluster0.a9azn.mongodb.net/local_library?retryWrites=true');
// Get arguments passed on command line
var userArgs = process.argv.slice(2);
/*
if (!userArgs[0].startsWith('mongodb')) {
console.log('ERROR: You need to specify a valid mongodb URL as the first argument');
return
}
*/
var async = require('async')
var Book = require('./models/book')
var Author = require('./models/author')
var Genre = require('./models/genre')
var BookInstance = require('./models/bookinstance')
var mongoose = require('mongoose');
var mongoDB = userArgs[0];
mongoose.connect(mongoDB, {useNewUrlParser: true, useUnifiedTopology: true});
mongoose.Promise = global.Promise;
var db = mongoose.connection;
db.on('error', console.error.bind(console, 'MongoDB connection error:'));
var authors = []
var genres = []
var books = []
var bookinstances = []
function authorCreate(first_name, family_name, d_birth, d_death, cb) {
authordetail = {first_name:first_name , family_name: family_name }
if (d_birth != false) authordetail.date_of_birth = d_birth
if (d_death != false) authordetail.date_of_death = d_death
var author = new Author(authordetail);
author.save(function (err) {
if (err) {
cb(err, null)
return
}
console.log('New Author: ' + author);
authors.push(author)
cb(null, author)
} );
}
function genreCreate(name, cb) {
var genre = new Genre({ name: name });
genre.save(function (err) {
if (err) {
cb(err, null);
return;
}
console.log('New Genre: ' + genre);
genres.push(genre)
cb(null, genre);
} );
}
function bookCreate(title, summary, isbn, author, genre, cb) {
bookdetail = {
title: title,
summary: summary,
author: author,
isbn: isbn
}
if (genre != false) bookdetail.genre = genre
var book = new Book(bookdetail);
book.save(function (err) {
if (err) {
cb(err, null)
return
}
console.log('New Book: ' + book);
books.push(book)
cb(null, book)
} );
}
function bookInstanceCreate(book, imprint, due_back, status, cb) {
bookinstancedetail = {
book: book,
imprint: imprint
}
if (due_back != false) bookinstancedetail.due_back = due_back
if (status != false) bookinstancedetail.status = status
var bookinstance = new BookInstance(bookinstancedetail);
bookinstance.save(function (err) {
if (err) {
console.log('ERROR CREATING BookInstance: ' + bookinstance);
cb(err, null)
return
}
console.log('New BookInstance: ' + bookinstance);
bookinstances.push(bookinstance)
cb(null, book)
} );
}
function createGenreAuthors(cb) {
async.series([
function(callback) {
authorCreate('Patrick', 'Rothfuss', '1973-06-06', false, callback);
},
function(callback) {
authorCreate('Ben', 'Bova', '1932-11-8', false, callback);
},
function(callback) {
authorCreate('Isaac', 'Asimov', '1920-01-02', '1992-04-06', callback);
},
function(callback) {
authorCreate('Bob', 'Billings', false, false, callback);
},
function(callback) {
authorCreate('Jim', 'Jones', '1971-12-16', false, callback);
},
function(callback) {
genreCreate("Fantasy", callback);
},
function(callback) {
genreCreate("Science Fiction", callback);
},
function(callback) {
genreCreate("French Poetry", callback);
},
],
// optional callback
cb);
}
function createBooks(cb) {
async.parallel([
function(callback) {
bookCreate('The Name of the Wind (The Kingkiller Chronicle, #1)', 'I have stolen princesses back from sleeping barrow kings. I burned down the town of Trebon. I have spent the night with Felurian and left with both my sanity and my life. I was expelled from the University at a younger age than most people are allowed in. I tread paths by moonlight that others fear to speak of during day. I have talked to Gods, loved women, and written songs that make the minstrels weep.', '9781473211896', authors[0], [genres[0],], callback);
},
function(callback) {
bookCreate("The Wise Man's Fear (The Kingkiller Chronicle, #2)", 'Picking up the tale of Kvothe Kingkiller once again, we follow him into exile, into political intrigue, courtship, adventure, love and magic... and further along the path that has turned Kvothe, the mightiest magician of his age, a legend in his own time, into Kote, the unassuming pub landlord.', '9788401352836', authors[0], [genres[0],], callback);
},
function(callback) {
bookCreate("The Slow Regard of Silent Things (Kingkiller Chronicle)", 'Deep below the University, there is a dark place. Few people know of it: a broken web of ancient passageways and abandoned rooms. A young woman lives there, tucked among the sprawling tunnels of the Underthing, snug in the heart of this forgotten place.', '9780756411336', authors[0], [genres[0],], callback);
},
function(callback) {
bookCreate("Apes and Angels", "Humankind headed out to the stars not for conquest, nor exploration, nor even for curiosity. Humans went to the stars in a desperate crusade to save intelligent life wherever they found it. A wave of death is spreading through the Milky Way galaxy, an expanding sphere of lethal gamma ...", '9780765379528', authors[1], [genres[1],], callback);
},
function(callback) {
bookCreate("Death Wave","In Ben Bova's previous novel New Earth, Jordan Kell led the first human mission beyond the solar system. They discovered the ruins of an ancient alien civilization. But one alien AI survived, and it revealed to Jordan Kell that an explosion in the black hole at the heart of the Milky Way galaxy has created a wave of deadly radiation, expanding out from the core toward Earth. Unless the human race acts to save itself, all life on Earth will be wiped out...", '9780765379504', authors[1], [genres[1],], callback);
},
function(callback) {
bookCreate('Test Book 1', 'Summary of test book 1', 'ISBN111111', authors[4], [genres[0],genres[1]], callback);
},
function(callback) {
bookCreate('Test Book 2', 'Summary of test book 2', 'ISBN222222', authors[4], false, callback)
}
],
// optional callback
cb);
}
function createBookInstances(cb) {
async.parallel([
function(callback) {
bookInstanceCreate(books[0], 'London Gollancz, 2014.', false, 'Available', callback)
},
function(callback) {
bookInstanceCreate(books[1], ' Gollancz, 2011.', false, 'Loaned', callback)
},
function(callback) {
bookInstanceCreate(books[2], ' Gollancz, 2015.', false, false, callback)
},
function(callback) {
bookInstanceCreate(books[3], 'New York Tom Doherty Associates, 2016.', false, 'Available', callback)
},
function(callback) {
bookInstanceCreate(books[3], 'New York Tom Doherty Associates, 2016.', false, 'Available', callback)
},
function(callback) {
bookInstanceCreate(books[3], 'New York Tom Doherty Associates, 2016.', false, 'Available', callback)
},
function(callback) {
bookInstanceCreate(books[4], 'New York, NY Tom Doherty Associates, LLC, 2015.', false, 'Available', callback)
},
function(callback) {
bookInstanceCreate(books[4], 'New York, NY Tom Doherty Associates, LLC, 2015.', false, 'Maintenance', callback)
},
function(callback) {
bookInstanceCreate(books[4], 'New York, NY Tom Doherty Associates, LLC, 2015.', false, 'Loaned', callback)
},
function(callback) {
bookInstanceCreate(books[0], 'Imprint XXX2', false, false, callback)
},
function(callback) {
bookInstanceCreate(books[1], 'Imprint XXX3', false, false, callback)
}
],
// Optional callback
cb);
}
async.series([
createGenreAuthors,
createBooks,
createBookInstances
],
// Optional callback
function(err, results) {
if (err) {
console.log('FINAL ERR: '+err);
}
else {
console.log('BOOKInstances: '+bookinstances);
}
// All done, disconnect from database
mongoose.connection.close();
});
Goal For Round 8 of the #100DaysofCode Challenge
This is my eighth round of the “#100daysofcode” challenge. I will be continuing my work from round five, six, and seven into round eight. I was working through the book “Cracking the Coding Interview” by Gayle Laakmann McDowell. My goal was to become more familiar with algorithms and data structures. This goal was derived from my goal to better understand operating systems and key programs that I use in the terminal regularly e.g. Git. This goal was in turn derived from my desire to better understand the fundamental tools used for coding outside of popular GUIs. This in turn was derived from my desire to be a better back-end developer.
I am currently putting a pause on the algorithm work to build some backend/full stack projects. I primarily want to improve my skills with the back-end from an implementation perspective. I have improved tremendously in terminal and CLI skills but I lost focus due to how abstract the algorithm concepts got. I wanted to work on things that were more tangible until I can get to a position where I could directly benefit from improving my algorithm skills and theoretical knowledge. So that’s the focus right now. Build my backend skills and prove my full stack capabilities by building some dope projects.
Again, I still have no idea if my path is correct but I am walking down this road anyways. Worst case scenario I learn a whole bunch of stuff that will help me out on my own personal projects. Best case scenario I actually become one of those unicorn developers that go on to start a billion dollar company… You never know LOL.