If you need to convert an SVG source to PS or EPS, the most common suggestion on the interwebs is to use Inkscape from the commandline.
Inkscape is a fairly resource-heavy tool with lots of dependencies. A great alternative for converting is CairoSVG.
CairoSVG is available on most Linux distros through their package management systems, e.g. apt install cairosvg on Ubuntu.
It has few dependencies (most importantly Python 3 and some related packages, but really not much)...
When your Rails application offers downloading a bunch of files as ZIP archive, you basically have two options:
This card is about option 2, and it is actually fairly easy to set up.
We are using this to generate ZIP archives with lots of files (500k+) on the fly, and it works like a charm.
Offering downloads of large archives can be cumbersome:
The inset CSS property is a shorthand that corresponds to the top, right, bottom, and/or left properties. It has the same multi-value syntax of the margin shorthand.
<div class="outer">
<div class="inner">
Some text
</div>
</div>
.outer {
background-color: cyan;
position: relative;
width: 500px;
height: 500px;
}
https://jsfiddle.net/jqx68wem/
.inner {
background-color: darkCyan;
position: absolute;
top: 10px;
right: 10px;
bottom: 10p...
It might sometimes be useful to check whether your Rails application accesses the file system unnecessarily, for example if your file system access is slow because it goes over the network.
The culprit might be a library like carrierwave that checks file existence or modification times, whereas your application could determine all this from your database.
One option it to use strace for this, which logs all system calls performed by a process.
To do this, start your rails server using something like
DISA...
When you are working with SVG files and ImageMagick you can get different results on different machines depending on which additional packages you have installed.
From: http://www.imagemagick.org/script/formats.php
ImageMagick utilizes inkscape if its in your execution path otherwise RSVG. If neither are available, ImageMagick reverts to its internal SVG renderer.
This card explains how to generate an entity relationship diagram for your Rails application.
We also show how to limit your ERD to a subset of models, e.g. models inside a namespace.
This are the steps I needed to do to add esbuild to an application that used the vanilla rails asset pipeline with sprockets before.
.nvmrc with your preferred node version (and install it)jsbundling-rails and foreman to your Gemfile:
gem 'jsbundling-rails'
group :development, :test do
gem 'foreman'
# ...
end
bundle installbin/rails javascript:install:esbuild in a console to prepare esbuild.yarn install...Attaching files to a field that is handled by Carrierwave uploaders (or maybe any other attachment solution for Rails) in tests allows different approaches. Here is a short summary of the most common methods.
You might also be interested in this card if you see the following error in your test environment:
CarrierWave::FormNotMultipart:
You tried to assign a String or a Pathname to an uploader, for security reasons, this is not allowed.
If this is a file upload, please check that your upload form is multipart encoded.
ImageMagick can convert SVGs to raster image formats.
Example for PNG:
convert input.svg output.png
If the SVG has a size of 24x24 (viewBox="0 0 24 24"), the resulting PNG will also have a size of 24x24.
An SVG's viewBox specifies the intended size, but vector image formats can be scaled freely.
If you want your raster image to be larger, the naive approach would be to use the resize flag.
convert -resize 96x96 input.svg output.png
However, this resu...
A flaky test is a test that is often green, but sometimes red. It may only fail on some PCs, or only when the entire test suite is run.
There are many causes for flaky tests. This card focuses on a specific class of feature with heavy side effects, mostly on on the UI. Features like the following can amplify your flakiness issues by unexpectedly changing elements, causing excessive requests or other timing issues:
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 use a MySQL docker image for this purpose.
docker run --name projectname_db -e MYSQL_ROOT_PASSWORD=secret -p "33008:3306" -d --restart unless-stopped mysql:5.7
The port 33008 is a freely chosen free port on the host machine that will be used to establish a con...
You can scale background images in CSS to the container size using background-size (Demo).
Commonly, we use contain or cover because we want to preserve the image's aspect ratio.
If you do not want to do that, simply provide scaling values for X and Y:
background-size: 100% 100%
(a simple 100% would mean 100% auto and respect the image's aspect ratio)
The above may not work for you when ...
When using custom properties in your stylesheets, you may want to set a specific property value to an existing variable in your SASS environment. A pratical example would be a list of color variables that you've defined in colors.sass and that you would like to refer to in your stylesheets. However, simply assigning a variable will not work:
$my-great-blue: blue
:root
--my-color: $my-great-blue
.sky
background-color: var(--my-color)
The property value will not be valid and if you open the browser's inspection window, yo...
Accessing other repositories in Gitlab CI is not straight forward, since the access rights of the current pipeline might not be sufficient enough.
One approach is to use project access tokens and clone the repositories via HTTPS.
read_repository
false ...When giving a presentation where you do some coding, the font size you usually use is probably a bit too small and makes code hard to read for users on smaller screens or low-bandwidth connections when the image quality is lower.
Here are two solutions.
RubyMine offers a "Presentation Mode" which you can use. Simply navigate to View → Appearance → Enter Presentation Mode to enable it.
This will increase your code editor's font size as well as your UI and works nicely when sharing a single file.
However, some control...
When storing files for lots of records in the server's file system, Carrierwave's default store_dir approach may cause issues, because some directories will hold too many entries.
The default storage directory from the Carrierwave templates looks like so:
class ExampleUploader < CarrierWave::Uploader::Base
def store_dir
"uploads/#{model.class.to_s.underscore}/#{mounted_as}/#{model.id}"
end
end
If you store files for 500k records, that store_dir's parent directory will have 500k sub-directories which will cause some...
When deleting a record in your Rails app, Carrierwave automatically takes care of removing all associated files.
However, the file's container directory will not be removed automatically. If you delete records regularly, this may be an annoyance.
Here is a solution which was adapted from the Carrierwave GitHub wiki and cleans up any empty parent directories it can find.
class ExampleUploader < CarrierWave...
Webpack builds can take a long time, so we only want to compile when needed.
This card shows what will cause Webpacker (the Rails/Webpack integration) to compile your assets.
While development it is recommended to boot a webpack dev server using bin/webpack-dev-server.
The dev server compiles once when booted. When you access your page on localhost before the initial compilation, the page may load without assets.
The ...
To attach files to your records, you will need a new database column representing the filename of the file. To do this, add a new migration (rails g migration <name>) with the following content:
class AddAttachmentToNotes < ActiveRecord::Migration[6.0]
def change
add_column :notes, :attachment, :string
end
end
Don't forget to rename the class and change the column details to fit your purpose. Run it.
The first way is to store your Carrierwave attachments not ...
When you have a hex color code, you can easily convert it into its RGB values using plain Ruby.
>> "#ff8000".match(/^#(..)(..)(..)$/).captures.map(&:hex)
=> [255, 128, 0]
You can use that to implement a simple "hex to CSS rgba value with given opacity" method:
def hex_color_to_rgba(hex, opacity)
rgb = hex.match(/^#(..)(..)(..)$/).captures.map(&:hex)
"rgba(#{rgb.join(", ")}, #{opacity})"
end
>> hex_color_to_rgba("#ff8000", 0.5)
=> "rgba(255, 128, 0, 0.5)"
If you need to support RGBA hex color codes,...
When your Rails application server raises error, Capybara will fail your test when it clears the session after the last step. The effect is a test that passes all steps, but fails anyway.
Capybara's behavior will help you to detect and fix errors in your application code. However, sometimes your application will explode with an error outside your control. Two examples:
We had the issue, that a VCR spec failed, after updating CarrierWave from version 0.11.0 to 1.3.2.
In this version, CarrierWave uses the gem SsrfFilter, which retrieves the IP addresses for the given hostname and replaces the hostname in the requested url with one of them.
It works with IPv4 addresses, but not with IPv6 addresses, because WebMock cannot handle those correctly:
uri = "#{protocol}://...
CarrierWave comes with a set of default configuration options which make sense in most cases. However, you should review these defaults and adjust for your project wherever necessary.
You will also find suggestions on what to change below.
Here is the current default config for version 2:
config.permissions = 0644
config.directory_permissions = 0755
config.storage_engines = {
:f...