Run multiple local webricks at the same time using different ports
If you specify different ports, you can run multiple local webricks with rails server --port=300X at the same time.
Related cards:
How to use Parallel to speed up building the same html partial multiple times (for different data)
The parallel-gem is quite easy to use and can speed up rendering time if you want to render the same partial multiple times (e.g. for rendering long lists of things).
If your parallelized code talks to the da...
Using multiple MySQL versions on the same linux machine using docker
We had a card that described how to install multiple mysql versions using mysql-sandbox. Nowadays with the wide adoption of docker it might be easier to u...
VCR fails if the same request is triggered multiple times
Same requests are recorded only once in vcr. Replaying a test fails, if you trigger the same request multiple times. The error message is somehow confusing, as your cassette contains the request:
`An HTTP request has...
Why has_many :through associations can return the same record multiple times
An association defined with has_many :through will return the same record multiple times if multiple join models for the same record exist (a n:m relation). To prevent this, you need to add ->{ uniq } as second argument to has_many (below Ra...
Use different CSS depending on whether elements render on the same line or multiple lines
You will find this useful when creating responsive designs that work well on small screens.
The attached Javascript gives a container different CSS classes (single_line or multiple_lines) depending on whether its children render on one line o...
How to run a small web server (one-liner)
Sometimes you just want to have a small web server that serves files to test something.
Serve the current directory
On Ruby 1.9.2+ you can do the following ("." for current directory).
ruby -run -ehttpd . -p8000
Python 2.x offers a s...
RSpec and Cucumber: Shorthand syntax to run multiple line numbers in the same file
This works in modern RSpecs (RSpec >= 2.x) and Cucumbers:
rspec spec/models/node_spec.rb:294:322
cucumber features/nodes.feature:543:563:579
Also your features should be shorter than that :)
Debug SAML in development using a local keycloak server
Developing or debugging SAML functionality can be a hassle, especially when you need to go back and forth with someone external who is managing the identity provider (IDP).
But you can setup a local keycloak server t...
Installing multiple MySQL versions on the same Linux with mysql-sandbox
Ubuntu has a package mysql-sandbox that lets you install multiple MySQL versions into your user home:
- Install
mysql-sandbox
sudo apt install mysql-sandbox
- Download the version of MySQL you want to use from mysql.com:
<https://...
Using ngrok for exposing your development server to the internet
Sometimes you need to access a dev server running on localhost from another machine that is not part of the same network. Maybe you want to use your phone to test a web page, but are only in a guest WiFi. In the past, we often used [some port forw...