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require 'active_record' | |
require 'arel' | |
# Ruby-like syntax in AR conditions using the underlying Arel layer (Rails >= 3.0). | |
# | |
# What you would usually write like this: | |
# | |
# User.where(["users.created_at > ? AND users.name LIKE ?", Date.yesterday, "Mary"]) | |
# | |
# can now be written like this (note those parentheses required by the operators precedences): |
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literally always have to look up the meaning of :limit in migrations when it comes to integer values. Here's an overview. Now let's memorise it (oh, this works for MySQL, other databases may work differently): | |
:limit Numeric Type Column Size Max value | |
1 tinyint 1 byte 127 | |
2 smallint 2 bytes 32767 | |
3 mediumint 3 byte 8388607 | |
nil, 4, 11 int(11) 4 byte 2147483647 | |
5..8 bigint 8 byte 9223372036854775807 | |
Note: by default MySQL uses signed integers and Rails has no way (that I know of) to change this behaviour. Subsequently, the max. values noted are for signed integers. |
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data:text/html, <style type="text/css">#e{position:absolute;top:0;right:0;bottom:0;left:0;}</style><div id="e"></div><script src="http://d1n0x3qji82z53.cloudfront.net/src-min-noconflict/ace.js" type="text/javascript" charset="utf-8"></script><script>var e=ace.edit("e");e.setTheme("ace/theme/monokai");e.getSession().setMode("ace/mode/ruby");</script> |
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#include <Arduino.h> | |
#include <M5StickC.h> | |
#include <utility/MPU6886.h> // used for accessing MPU constants | |
#include <driver/rtc_io.h> | |
void mpu6886_wake_on_motion_isr(void); // declaration of ISR | |
void mpu6886_wake_on_motion_setup(void); // declaration of setup | |
// lifted from https://github.com/m5stack/M5StickC/blob/master/src/utility/MPU6886.cpp | |
// if integrated with M5StickC library, use internal class function instead |
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#include <Arduino.h> | |
#include <U8x8lib.h> | |
// Pin 16 OLED Reset | |
// Pin 4,5 I2C | |
// use Board "Wemos D1 Mini R2", 80Mhz, 4(3)MB Flash, 921600baud to flash | |
U8X8_SSD1306_128X32_UNIVISION_HW_I2C u8x8(16); |
This is a basic exploration of the Ello API. Completely unofficial, your mileage my vary, don't smash their servers as they are likely very busy.
Methods return HTML for their representation where appropriate which is a nice little pattern. Everything returns application/json.
Like this:
{
"id": ,
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app = angular.module 'BlogExample', [] | |
# Simple controller that loads all blog posts | |
app.controller 'BlogCtrl', ['$scope', 'Blog', ($scope, Blog) -> | |
# Get all the blog posts | |
Blog.all().then (posts) -> | |
$scope.posts = posts | |
# Extend the $scope with our own properties, all in one big block | |
# I like this because it looks like declaring a class. |
#!/usr/bin/env bash
# Assuming OS X Yosemite 10.10.4
# Install XCode and command line tools
# See https://itunes.apple.com/us/app/xcode/id497799835?mt=12#
# See https://developer.apple.com/library/mac/documentation/Darwin/Reference/ManPages/man1/xcode-select.1.html
xcode-select --install
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require 'yaml' | |
require 'logger' | |
require 'active_record' | |
namespace :db do | |
def create_database config | |
options = {:charset => 'utf8', :collation => 'utf8_unicode_ci'} | |
create_db = lambda do |config| | |
ActiveRecord::Base.establish_connection config.merge('database' => nil) |
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