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Using Rails serialize to save hash to database
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174
The column type is wrong. You should use Text instead of String. Therefore, your migration sho...
How do you write a migration to rename an ActiveRecord model and its table in Rails?
...d to go and rename the model declaration file manually.
Edit:
In Rails 3.1 & 4, ActiveRecord::Migration::CommandRecorder knows how to reverse rename_table migrations, so you can do this:
class RenameOldTableToNewTable < ActiveRecord::Migration
def change
rename_table :old_table_name,...
Calculate difference between two datetimes in MySQL
...MySQL function. For example, you can use:
SELECT TIMESTAMPDIFF(SECOND, '2012-06-06 13:13:55', '2012-06-06 15:20:18')
In your case, the third parameter of TIMSTAMPDIFF function would be the current login time (NOW()). Second parameter would be the last login time, which is already in the database....
.prop('checked',false) or .removeAttr('checked')?
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131
jQuery 3
As of jQuery 3, removeAttr does not set the corresponding property to false anymore:
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Active Record - Find records which were created_at before today
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165
Using ActiveRecord the standard way:
MyModel.where("created_at < ?", 2.days.ago)
Using t...
What does an underscore in front of an import statement mean?
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edited Jun 20 at 9:12
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answered Jan 20 '14 at 1:52
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How to set up a git project to use an external repo submodule?
...hem to Subversion's svn:externals mechanism: http://speirs.org/blog/2009/5/11/understanding-git-submodules.html
* As a best practice, you should always place your submodules in their own directory, such as Externals. If you don't, your root project directory can become very cluttered very fast.
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Understanding the Event Loop
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1: If we are talking about a single-threaded application, then what processes setTimeouts while JS engine accepts more requests and executes them? Isn't that single thread will continue working on other requests? Then who is ...
How to handle command-line arguments in PowerShell
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