them0nk

#Model 

@user.should have(1).error_on(:username) # Checks whether there is an error in username 
@user.errors[:username].should include("can't be blank")  # check for the error message 

#Rendering
response.should render_template(:index)

#Redirecting 
response.should redirect_to(movies_path)

HasAndries

angular.module('bDatepicker', []).
  directive('bDatepicker', function(){
    return {
      require: '?ngModel',
      restrict: 'A',
      link: function($scope, element, attrs, controller) {
        var updateModel;
        updateModel = function(ev) {
          element.datepicker('hide');
          element.blur();

CSS-responsive-grid-of-hexagons.markdown

CSS responsive grid of hexagons

Grid of regular hexagons using only CSS with a hover effect to show text. This grid is responsive.

A Pen by web-tiki on CodePen.

License.

hoanghiep90

I need to install pg 0.17.1 gem on a server running CentOS. This is the error message I saw:

# gem install pg -v '0.17.1'
Building native extensions.  This could take a while...
ERROR:  Error installing pg:
        ERROR: Failed to build gem native extension.

/usr/bin/ruby extconf.rb
checking for pg_config... no
No pg_config... trying anyway. If building fails, please try again with

ivanvermeyen

Update - 4 september 2020

Making multiple MySQL versions work with Homebrew was tricky to say the least. Fortunately there are 2 new easy ways that I learned of to achieve this.

DBngin app

As @4unkur and @henrytirla commented below, there is this extremely easy to use app called DBngin, which lets you setup multiple databases (not only MySQL) simultaneously using different ports:

https://dbngin.com/