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Simplest intro to git by github and codeschool - Try Git
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[Intro to github]
SQL to MongoDB Mapping Chart¶
In addition to the charts that follow, you might want to consider the Frequently Asked Questions section for a selection of common questions about MongoDB.
Executables¶
The following table presents the MySQL/Oracle executables and the corresponding MongoDB executables.
I've developed a useful feature in KeystoneJS that lets you populate a relationship from either side, while only storing the data on one side, and am looking for feedback on whether it is something that could / should be brought back into mongoose itself. (It might be possible to add as a separate package but I suspect there'd be too much rewriting of mongoose internals for that to be a good idea).
I've added this as an issue in mongoose for consideration: #1888 but am leaving this gist in place because the examples are easier to read.
I've used Posts and Categories as a basic, contrived example to demonstrate what I'm talking about here; in reality you'd rarely load all the posts for a category but there are other real world cases where it's less unreasonable you'd want to do this, and Posts + Categories is an easy way to demo it.
The built-in population feature is really useful; not just for
/* ******************************************************************************************* | |
* THE UPDATED VERSION IS AVAILABLE AT | |
* https://github.com/LeCoupa/awesome-cheatsheets | |
* ******************************************************************************************* */ | |
// 0. Synopsis. | |
// http://nodejs.org/api/synopsis.html | |
# See list of docker virtual machines on the local box | |
$ docker-machine ls | |
NAME ACTIVE URL STATE URL SWARM DOCKER ERRORS | |
default * virtualbox Running tcp://192.168.99.100:2376 v1.9.1 | |
# Note the host URL 192.168.99.100 - it will be used later! | |
# Build an image from current folder under given image name | |
$ docker build -t gleb/demo-app . |
I really liked @tjvantoll article Handling Failed HTTP Responses With fetch(). The one thing I found annoying with it, though, is that response.statusText
always returns the generic error message associated with the error code. Most APIs, however, will generally return some kind of useful, more human friendly message in the body.
Here's a modification that will capture this message. The key is that rather than throwing an error, you just throw the response and then process it in the catch
block to extract the message in the body:
fetch("/api/foo")
.then( response => {
if (!response.ok) { throw response }
return response.json() //we only get here if there is no error
})
#cription: This file holds all my BASH configurations and aliases | |
# | |
# Sections: | |
# 1. Environment Configuration | |
# 2. Make Terminal Better (remapping defaults and adding functionality) | |
# 3. File and Folder Management | |
# 4. Searching | |
# 5. Process Management | |
# 6. Networking | |
# 7. System Operations & Information |
There is no way to store an empty object/array/null value. | |
There are also no actual arrays. Array values get stored as objects with integer keys. | |
(If all keys are integers, it will be returned as an array.) | |
Basically, it's one giant tree of hashes with string keys. | |
Simply write a value to any location, and the intermediary locations will automatically come into existance. | |
── Classes ── | |
DataSnapshot : Container for a subtree of data at a particular location. |