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When to Redis? When to MongoDB? [closed]
...-driven relational database: relational databases simplify to indexed CSV files, each file being a table; document stores simplify to indexed JSON files, each file being a document, with multiple files grouped together.
JSON files are similar in structure to XML and YAML files, and to dictionaries...
Genymotion, “Unable to load VirtualBox engine.” on Mavericks. VBox is setup correctly
...
Be cautioned. When I deleted the file, my machine immediately shutdown. Save your work! Started up fine, and I uninstalled both and reinstalled, and it started working again.
– Jahmic
Apr 9 '17 at 14:03
...
What are Long-Polling, Websockets, Server-Sent Events (SSE) and Comet?
...requested webpage and executes the JavaScript on the page which requests a file from the server at regular intervals (e.g. 0.5 seconds).
The server calculates each response and sends it back, just like normal HTTP traffic.
Ajax Long-Polling:
A client requests a webpage from a server using regu...
How to use concerns in Rails 4
...e Taggable
...
end
# app/models/concerns/taggable.rb
# notice that the file name has to match the module name
# (applying Rails conventions for autoloading)
module Taggable
extend ActiveSupport::Concern
included do
has_many :taggings, as: :taggable
has_many :tags, through: :tagging...
Getting the last element of a list
...handled:
>>> empty_list[-1]
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
IndexError: list index out of range
But again, slicing for this purpose should only be done if you need:
a new list created
and the new list to be empty if the prior list wa...
REST API - why use PUT DELETE POST GET?
...y to specify the type of data explicitly would be via the already existing file extension such as .js, .json, .html, or .xml. A missing file extension would default to whatever format is default (such as JSON); a file extension that's not supported could return a 501 Not Implemented status code.
An...
Multiple working directories with Git?
...e current repository, sharing everything except working
directory specific files such as HEAD, index, etc.
The git worktree section adds:
A git repository can support multiple working trees, allowing you to check out more than one branch at a time.
With git worktree add, a new working tree is asso...
CSS Classes & SubClasses
...much never use that feature of CSS if you want one clean cross-browser CSS file.
The solution then is to use CSS classname prefixes to avoid colliding wiht generic classnames:
.area1 { ... }
.area1.area1Larger { ... }
.area2.area2Larger { ... }
May as well use just one class, but that way you c...
XDocument or XmlDocument
...://somewhere.com";
XElement element = new XElement(ns + "elementName");
// etc
LINQ to XML also works really well with LINQ - its construction model allows you to build elements with sequences of sub-elements really easily:
// Customers is a List<Customer>
XElement customersElement = new XE...
How do I find and view a TFS changeset by comment text?
...
You can use the command line client: pipe the output of tf history to a file and then use whatever search program you prefer.
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