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How to get the original value of an attribute in Rails
...ails 5.1+
Copied from Lucas Andrade's answer below: https://stackoverflow.com/a/50973808/9359123
Appending _was is deprecated in rails 5.1, now you should append _before_last_save
Something like:
before_save object
do_something_with object.name_before_last_save
end
Will return the name va...
Rails - Validate Presence Of Association?
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You can use validates_presence_of http://apidock.com/rails/ActiveModel/Validations/ClassMethods/validates_presence_of
class A < ActiveRecord::Base
has_many :bs
validates_presence_of :bs
end
or just validates
http://apidock.com/rails/ActiveModel/Validations/ClassMe...
What algorithm does Readability use for extracting text from URLs?
...this topic and I would like to explain the background of why it is easy to come up with a solution that works well and when it gets hard to get close to 100% accuracy.
There seems to be a linguistic law underlying in human language that is also (but not exclusively) manifest in Web page content, wh...
Django - what is the difference between render(), render_to_response() and direct_to_template()?
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https://docs.djangoproject.com/en/1.8/topics/http/shortcuts/#render
render(request, template[, dictionary][, context_instance][, content_type][, status][, current_app])
render() is a brand spanking new shortcut for render_to_response in 1.3 that wil...
What is AssemblyInfo.cs used for?
...n, version, etc. You can find more details about its content
reading the comments that are included in it.
If you delete it, your assembly will be compiled with no information,
i.e., in the Details tab of the file properties you will see no name,
no description, version 0.0.0.0, etc.
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What ports does RabbitMQ use?
...t does look like the management port has changed to 15672 in 3.x: rabbitmq.com/management.html#configuration
– Greg M. Krsak
Mar 12 '13 at 13:29
4
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How to install Xcode Command Line Tools
How do I get the command-line build tools installed with the current Xcode/Mac OS X v10.8 (Mountain Lion) or later?
13 Answ...
Maven: missing net.sf.json-lib
...mework 1.x, you can't use this jar from maven central - play.lighthouseapp.com/projects/57987-play-framework/tickets/…
– ripper234
Dec 26 '12 at 16:07
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Necessary to add link tag for favicon.ico?
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