When you want to format only line breaks, you probably do not want simple_format
For outputting a given String in HTML, you mostly want to replace line breaks with <br> or <p> tags.
You can use simple_format, but it has side effects like keeping some HTML.
If you only care about line breaks, you might be better off using a small, specialized helper method:
def format_linebreaks(text)
safe_text = h(text)
paragraphs = split_paragraphs(safe_text).map(&:html_safe)
html = ''.html_safe
paragraphs.each do |paragraph|
html << content_tag(:p, paragraph)
end
...
Reading an element's attributes with Capybara
capybara_element['attribute_name'] allows accessing an element's attributes in Capybara.
A few examples:
find('#my_element')['class']
# => "first-class second-class"
find('#my_input')['placeholder']
# => "My placeholder value"
find('a#example-link')['href']
# => "http://example.com"
find('#my_element')['missing_attribute']
# => nil
How to negate scope conditions in Rails
Rails does not offer a "vanilla" way of negating an ActiveRecord scope. Here are two ways to do it yourself without too much effort.
Example:
class User
scope :admins, -> { where(role: ['admin', 'superuser'] }
# ...
end
Now what if we want a scope of users that are not admins? While you could declare a second scope like scope :non_admins, -> { where(role: ['guest', 'editor']) }, there are ways to use the opposite of the admins scope.
Option A: Subquery
You could just use a subquery. Doing that with scopes is easy...
CarrierWave: How to remove GIF animation
When accepting GIF images, you will also accept animated GIFs. Resizing them can be a time-consuming task and will block a Rails worker until the image is processed.
Save yourself that trouble, and simply tell ImageMagick to drop any frames but the first one.
Add the following to your uploader class:
process :remove_animation
private
def remove_animation
if content_type == 'image/gif'
manipulate! { |image| image.collapse! }
end
end
You may also define that process for specific versions only (e....
Debugging SPF records
While debugging a SPF record I found spf-record.de to be very helpful.
- it lists all IPs that are covered by the SPF record
- shows syntax errors
- helps you debugging errors like DNS lookup limit reached
- it also lets you test a new SPF strings before applying it. This can save you time as you don't have to loop with operations
Also the advanced check at vamsoft.com has a very good interface to test new SPF policies.
Geordi 4.2.0 released
We released a new version of our gem geordi
4.2.0 2020-10-02
Compatible changes
- Add
auto_update_chromedriveras global setting option to automatically update chromedriver before cucumber
tests, if Chrome and chromedriver versions don't match. - Dump command: Add support for multiple databases
- Add Ruby 2.7 to list of supported Ruby versions
- Fix #115:
geordi cucumber --modifiedcommand, that corrupted filenames like:No such file or directory tures/pages.feature - Avoi...
Cucumber step to match table rows with Capybara
These steps are now part of Spreewald.
This note describes a Cucumber step that lets you write this:
Then I should see a table with the following rows:
| Bruce Wayne | Employee | 1972 |
| Harleen Quinzel | HR | 1982 |
| Alfred Pennyworth | Engineering | 1943 |
If there are additional columns or rows in the table that are not explicitely expected, the step won't complain. It does however expect the rows to be ordered as stat...
Always, always declare your associations with symbols
Never ever declare your associations with a string, especially when doing metaprogramming. A common mistake is something like
# WRONG
class Page < ActiveRecord::Base
%w[main sub].each do |type|
belongs_to "#{type}_title"
end
end
# RIGHT
class Page < ActiveRecord::Base
%w[main sub].each do |type|
belongs_to :"#{type}_title"
end
end
Always convert to a symbol, otherwise you'll have [all](/makandra/4177-bugfix-rails-does-not-find-an-association-when-it-is-named-w...
Don't assign time values to date attributes
Do not pass times to date attributes. Always convert times to dates when your application uses time zones.
Background
A time-zoned Time attribute on a Rails record is converted to UTC using to_s(:db) to be stored, and converted back into the correct time zone when the record is loaded from the database. So when you are not on UTC, time objects will be converted as follows.
>> Time.current
=> Fri, 15 Mar 2013 11:56:03 CET +01:00
>> Time.current.to_s(:db)
=> "2013-03-15 10:56:03" # This is now UTC
Problem
That will...
What edge_rider offers you
edge_rider is Power tools for ActiveRecord relations (scopes). Please note that some of the functions edge_rider provides have native implementations in newer rails versions.
Useful in applications
Relation#traverse_association(*names)
Edge Rider gives your relations a method #traverse_association which returns a new relation by "pivoting" around a named association. You can traverse multiple associations in a single call. E.g. to turn a relation of posts into a relation of all posts o...