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Determine what attributes were changed in Rails after_save callback?
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Just to be clear: in my tests (Rails 4), if you are using an after_save callback, self.changed? is true and self.attribute_name_changed? is also true, but self.previous_changes returns an empty hash.
– sandre89
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How to Set Variables in a Laravel Blade Template
...es in views, so why make the "hack" more complicated then it needs to be?
Tested in Laravel 4.
Another benefit is that syntax highlighting works properly (I was using comment hack before and it was awful to read)
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How to write LaTeX in IPython Notebook?
...a nice way to print equation. Unfortunately, it's not performant and needs testing.
Example:
Granted, sympy is a great alternative and although prettyPy doesn't allow for evaluating expressions, variable initialization is not required.
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Iterating through a JSON object
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# example of json data object group with two values of key id
jsonstufftest = '{'group':{'id':'2','id':'3'}}
# always set your headers
headers = {'User-Agent': 'Moz & Woz'}
# the url you are trying to load and get json from
url = 'http://www.cooljson.com/cooljson.json'
# in python 3 you c...
Pad a string with leading zeros so it's 3 characters long in SQL Server 2008
... me today when a user entered a letter in the input string and I failed to test that case.
– Jeff Mergler
Apr 2 '19 at 23:56
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Filter Java Stream to 1 and only 1 element
...s exactly one (no more, no fewer) matching element. After my code, one can test result.size() to make sure it equals 1. If it's 2, then there's more than one match, so it's an error. If the code instead did limit(1), more than one match would result in a single element, which can't be distinguished ...
Python recursive folder read
...ious as me... this code sample writes a txt file to each directory. Glad I tested it in a version controlled folder, though everything I need to write a cleanup script is here too :)
– Steazy
Sep 24 '14 at 23:56
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How to do a Jquery Callback after form submit?
... set the AjaxOptions
@using (Ajax.BeginForm("UploadTrainingMedia", "CreateTest", new AjaxOptions() { HttpMethod = "POST", OnComplete = "displayUploadMediaMsg" }, new { enctype = "multipart/form-data", id = "frmUploadTrainingMedia" }))
{
... html for form
}
here is the submission code, this is ...
Ng-model does not update controller value
...pt's lexical scope feature.
Would be great if someone having this problem tests this way and inform us.
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How do I force files to open in the browser instead of downloading (PDF)?
... a different domain. CORS may allow that content to pass through (haven't tested).
– vol7ron
Jan 30 '17 at 23:21
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