If you want to see how long your database queries actually take, you need to disable MySQL's query cache. This can be done globally by logging into a database console, run
SET GLOBAL query_cache_type=OFF;
and restart your rails server.
You can also disable the cache on a per query basis by saying
SELECT SQL_NO_CACHE * FROM ...
You also probably want to disable Rails internal (per-request) cache. For this, wrap your code with a call to ActiveRecord::Base.uncached. For example, as an around_filter:
d...
This post will describe how I stumbled upon a code path in the Linux kernel which allows external programs to be launched when a core dump is about to happen. I provide a link to a short and ugly Ruby script which captures a faulting process, runs gdb to get a backtrace (and other information), captures the core dump, and then generates a notification email.
A good tool to generate strong passwords and secrets is "apg". You can get it with
sudo apt-get install apg
To create a strong secret for sessions, hashed Paperclip paths, etc. say
apg -m128 -a1 -E\'\"
Arguments explained:
-m parameter defines the secret length-a1 makes apg choose from all 7-bit ASCII characters instead of just the alphabet-E\'\" excludes quote characters so you can easily paste the secret into a Ru...Both these approaches will keep your GET parameters -- and will only work for GET requests.
Capybara:
When /^I reload the page$/ do
visit [ current_path, page.driver.request.env['QUERY_STRING'] ].reject(&:blank?).join('?')
end
Webrat:
When /^I reload the page$/ do
visit url_for(request.params)
end
For a step that distinguishes between drivers (Selenium, Rack::Test, Culerity), check [n4k3d.com](http://n4k3d.com/blog/2011/02/02/reloading-the-page-in-cucumber-with-capybara-and-seleniu...
When Paperclip attachments should only be downloadable for selected users, there are three ways to go.
The same applies to files in Carrierwave.
The first way is to store Paperclip attachments not in the default public/system, but in a private path like storage inside the current release. You should prefer this method when dealing with sensitive data.
Make ...
This will show you how to create a RSS feed that the Feed Validator considers valid.
Note that RSS is a poorly specified format. Consider using the Atom builder to make an Atom feed instead. Write a note here if you do.
Create a FeedsController to host the RSS feed. Such a controller is also useful to host other data feeds that tend to gather over the lifetime of an application, e.g. sitemap.xml.:
class...
I play mp3 files on my car stereo that are stored on a SD-Card.
When I've copied those mp3 files to the FAT formatted SD-Card on my Mac, then I will see those nasty resource fork files (beginning with "._") for every file and folder on my car stereo. In most cases those resource fork files are important and invisible and don't bother you – on my car stereo ...
In a great post about named routes in Rails, path vs. url, Viget Labs ponders which variant is best used.<br />
<br />
Most often we use foo_path, which when used in Rails URL helpers will generate a relative path, where foo_url generates a full URL. In most cases the path makes most sense, but not always.
This is an awesome gadget in your toolbox, even if your test coverage is great.
gem install ruby-debug (Ruby 1.8) or gem install debugger (Ruby 1.9)script/server --debugger
debugger anywhere in your codeTo return non-HTML responses (like XLS spreadsheets), we usually use the
respond_to do |format|
format.xls do
# send spreadsheet
end
end
This is often, but not always the same as checking for params[:format] == :xls, so don't rely on this when e.g. one format checks for authorization and the other doesn't.
params[:format] is only set when a user explicitly puts a .xls at the end of the URL.
The format.xls block also responds when the user's browser requests the application/excel MIME type.
If Internet Explo...
There are three ways to define your own RSpec matchers, with increasing complexibility and options:
RSpec::Matchers.define :be_a_multiple_of do |expected|
match do |actual|
actual % expected == 0
end
# optional
failure_message do |actual|
"expected that #{actual} would be a multiple of #{expected}"
end
# optional
failure_message_when_negated do |actual|
"expected that #{actual} would not be a multiple of #{expected}"
end
end
When deploying Rails applications you might have noticed that JS and CSS are not cached by all browsers.
In order to force Apache to add expiry dates to its response, add the attached .htaccess to the public directory. This will add a header such as Expires: Thu, 07 Oct 2010 07:21:45 GMT to the httpd response.
Check that you have mod_expires enabled. You need it for the attached .htaccess to work:
sudo a2enmod expires
You can add this:
When you roll custom URLs with hacks like routing-filter, you can put a spec like this into spec/routing/routing_spec.rb:
When working with times and dates in Rails applications, you need to deal with the following problem:
Time objects have a time zone. You can get the zone name by doing time_object.zone.Rails has two completely different modes ...
So you screwed up and copied Paperclip secrets from one project to another. Here is a semi-automatic, painful way to migrate your existing attachment files to new locations.
You need to follow this step by step, do not just copy the whole thing into the console!
# 1. Get old paths by doing something like this on the console:
old_paths = ModelWithAttachment.all.collect { |m| [m.id, File.dirname(m.image.path(:original)).gsub(/original$/, '') ] if m.image.file? }.compact.uniq
# 2. Now change the Paperclip secret on the co...
Capybara does not play nice with sites that have some actions protected by SSL, some not. A popular way to implement this in Rails is using the ssl_requirement plugin by DHH, which redirects a requests from HTTP to HTTPS if the requested action requires SSL and vice versa.
Capybara follows the redirect, but seems to forget the changed protocol for the next request. The only hack-free workaround right now is to use URLs in lieu of paths everywhere (links, form actions).
For a hackful fi...
An alternative to this technique is using VCR. VCR allows you to record and replay real HTTP responses, saving you the effort to stub out request/response cycles in close details. If your tests do require close inspection of requests and responses, Webmock is still the way.
WebMock is an alternative to FakeWeb when testing code that uses the network. You sh...
For example, to send a form and populate a preview div with the response.
$('content_form').request({
parameters: { 'preview': "1" }, // overrides parameters
onComplete: function(transport){
$('previewContent').update(transport.responseText);
}
});
The Rails router has been written and rewritten at least four times2, including a recent rewrite for the upcoming Rails 3. The syntax is now more concise.<br />
<br />
But never mind making it shorter! It’s time for a final rewrite: Let’s get rid of it altogether!
Ancestry is a gem/plugin that allows the records of a Ruby on Rails ActiveRecord model to be organised as a tree structure (or hierarchy). It uses a single, intuitively formatted database column, using a variation on the materialised path pattern. It exposes all the standard tree structure relations (ancestors, parent, root, children, siblings, descendants) and all of them can be fetched in a single sql query. Additional features are STI support, named_scopes, depth caching, depth constraints, easy migration from older plugins/gems, integrit...
Dir.glob(File.join RAILS_ROOT, 'app', 'models', '*.rb').collect{ |path| path[/.+\/(.+).rb/,1] }.collect(&:camelize).collect(&:constantize)
sudo gem install gettext --no-ri --no-rdocsudo gem install fast_gettext --no-ri --no-rdocscript/plugin install git://github.com/grosser/gettext_i18n_rails.git (didn't work as gem)cp locale/app.pot locale/de/app.po for every locale you want to use_('text') in your rails coderake gettext:find to let GetText find all translations usedSee the lemonade descriptions.
Unfortunately, the gem has a few problems:
All these problems are solved for us, in our own lemonade fork. This fork has since been merged to the original gem, maybe we can use t...
When you need to patch an existing gem, one way is to "vendor" the gem by copying it into the vendor/gems directory of your Rails project. You can then make any changes you require and Rails will use the vendored version of the gem after a server restart. Unfortunately you need to perform some additional steps to marry Rails and the copied gem. This notes describes what to do.
This is super-painful. If you just copy the gem to vendor/gems, Rails will complain:
Unpacked gem foolib in vendor/gems has no s...