...case Ruby does not detected the expected encoding of a file automatically you can specify the known encoding manually. Example with File.open file = File.open('some.bin', encoding: Encoding::ASCII_8BIT)
text.encoding => # Example with File.read text = File.read('some.bin', encoding: Encoding::ASCII_8BIT) text.encoding => # More details about the encoding of strings in Ruby can be found here...
...is hard coded. A popular example is extension_allowlist, which returns an array of strings and let's you only upload files that have a filename with an extension that...
...matches an entry in that array. Another useful validation can be size_range, which gives you a little bit of control over how your storage gets polluted.
...rails_performance (https://github.com/igorkasyanchuk/rails_performance) provides a lot of valuable information with very little setup cost. It only needs Redis which we use in the majority of our applications anyway...
Only problematic requests (> 500 ms) Longer history than "Recent requests" The "500 Errors" screen self-explanatory and hopefully always empty The "Custom Events" screen Let's you easily add...
I recently stumbled upon the Rails feature composed_of. One of our applications dealt with a lot of addresses and they were implemented as 7 separate columns in the DB...
...and Rails models. This seemed like a perfect use case to try out this feature. TLDR The feature is still a VERY leaky abstraction. I ran into a lot of...
...operators typeof and instanceof which work very differently. JavaScript has some primitive types, like string literals, that are not objects (as opposed to Ruby, where every value is an object...
...Some values are sometimes a primitive value (e.g. "foo") and sometimes an object (new String("foo")) and each form requires different checks There are three different types for null (null...
Webmocks hash_including is similar to RSpec::Mocks::ArgumentMatchers#hash_including. Be aware that hash_including (webmock v3.0.1) doesn't parse integer values to String. Without hash including you would...
uri = URI('http://example.com/?foo=1&bar=2') stub_request(:get, 'example.com').with(query: {foo: 1, bar: 2}) Net::HTTP.get(uri) # ===> Success If you only want to check if foo is present...
...previously announced it would not charge royalties for such video through December 31, 2015 (see http://www.mpegla.com/Lists/MPEG%20LA%20News%20List/Attachments/226/n-10-02-02.pdf), and today’s announcement makes clear that royalties will continue not to...
...be charged for such video beyond that time. Products and services other than Internet Broadcast AVC Video continue to be royalty-bearing...
Shoulda Matchers don't provide canditional validations (validations with if: option). Here is how to write tests for the condition: Class: class Employee < ActiveRecored::Base validates :office, presence: true, if...
describe Employee do describe '#office' do context 'is a manager' do before { allow(subject).to receive(:manager?).and_return(true) } it { is_expected.to validate_presence_of(:office) } end context 'is...
Here is a bash script that I use to auto-configure displays on Ubuntu 24.04 with Xorg. Background Ubuntu always sets the primary display to the 1st (i.e. internal) display...
...bottom-aligned (the default would be aligned at their top edges). As an oddly specific bonus (you may not need this), I adjust my internal display's resolution when connected...
...the same child table, declare a has_many association per condition with its own scope and dependent: :restrict_with_error, then declare the plain dependent: :destroy association last.
...The example below uses two scoped associations to keep things readable, but the same approach works with one, three, or any number of independent restrictions. class Account < ApplicationRecord
RAG is often equated with vector databases, embeddings, and semantic search. But RAG ("Retrieval-Augmented Generation") really is just 'put relevant data in the prompt' — the retrieval mechanism is up...
...to you. If your app already has any working search functionality, you can build a useful RAG pipeline with it. Semantic search can still be included later on, if really...
If you're on Ubuntu: sudo apt-get install ruby-dev On other platforms: Look for a package containing ruby header files. On Red Hat that's "ruby-devel" likely...
To force a check on your next reboot (here for your root partition), simply: touch /forcefsck To manually do this, here is how to do it for the first partition...
...on sda, when you are using ext4: fsck.ext4 -fn /dev/sda1 -f forces the check, even if everything seems okay. -n is a "read only" check, where nothing is changed and...
Rails supports time zones, but there are several pitfalls. Most importantly because Time.now and Time.current are completely different things and code from gems might use one or the other.
Your life will be easier if your application does not need to support time zones. Disable them like this: config.time_zone = 'Berlin' # Your local time zone config.active_record.default_timezone...
The git doc states on the difference of these two commands: git-restore[1] is about restoring files in the working tree from either the index or another commit. This...
...The command can also be used to restore the content in the index with --staged, or restore both the working tree and the index with --staged --worktree. By default, if...
...warning after upgrading to rails >= 2.3.10 DEPRECATION WARNING: The :overwrite_params option is deprecated. Specify all the necessary parameters instead. that is for example caused by url_for( :overwrite_params...
...link_to uses url_for internally, so you can can use params.merge {...
...} as the second parameter of link_to...
Stop MySQL: sudo service mysql stop Move (or copy) your mysql directory. If you want /mnt/mysql to be the new directory, do it like this:
.../var/lib/mysql /mnt/ Open your MySQL configuration (sudo vim /etc/mysql/my.cnf) and change the datadir value to your new path (e.g. /mnt/mysql) Modify your AppArmor configuration: sudo vim /etc/apparmor.d/usr.sbin.mysqld Change/copy the lines...
...you are done and all is well: remember to remove those entries again, or set the log level to 0, to switch off rewrite logging...
Embedding videos on a website is very easy, add a tag to your source code and it just works. Most of the time. The thing is: Both the operating...
...an 0.x version and has quite some development dependencies. It has the Apache license. streamio-ffmpeg seems to be perfect, but had its last release in 2016. It offers...
This step will pass if the specified select is sorted. Then /^the "(.*?)" select should be sorted$/ do |label, negate| select = find_field(label) options = select.all('option').reject { |o| o.value.nil? } options.collect...
...this custom matcher, the each_cons block can be replaced with: options.should be_naturally_sorted Usage Then the "Organizations" select should be sorted Depends on Capybara. This step is now...
PostgreSQL supports the SQL OVERLAPS operator. You can use it to test if two date ranges overlap: => SELECT ('2001-02-16'::date, '2001-12-21'::date) OVERLAPS...
overlaps -------- true An important caveat is that the date ranges are defined as start <= time < end. As such the later date is not included in the range:
Sometimes, due to git or other "accidents", important files get deleted or overwritten. At a state when even Ctrl+Z doesn't work anymore, you maybe can rescue your files...
...that file in the editor Go to RubyMine and click on VCS -> Local History -> Show History In the now open window, you should see all greater changes made to the...
Most forms have a single submit button that will save the record when pressed. Sometimes a form needs additional submit buttons like "accept" or "reject". Such buttons usually attempt...
...a state transition while updating the record. To process a form with multiple buttons, your server-side code will need to know which button was pressed. To do so you...
Never use raise_error without specifying the Error you expect. expect { do_a_lot_of_complicated_stuff }.to raise_error will be green if you make any error in programming...
...E.g. a simple typo would make the test above green. The block will catch the Spec:: exception and the test will be happy. Be sure to always have custom errors...