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What is `params.require(:person).permit(:name, :age)` doing in Rails 4?
...od throws an error. It returns an instance of ActionController::Parameters for the key passed into require.
The permit method returns a copy of the parameters object, returning only the permitted keys and values. When creating a new ActiveRecord model, only the permitted attributes are passed into ...
displayname attribute vs display attribute
... I see is that you cannot specify a ResourceType in DisplayName attribute. For an example in MVC 2, you had to subclass the DisplayName attribute to provide resource via localization. Display attribute (new in MVC3 and .NET4) supports ResourceType overload as an "out of the box" property.
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Right way to reverse pandas.DataFrame?
...ly:
data.iloc[::-1]
will reverse your data frame, if you want to have a for loop which goes from down to up you may do:
for idx in reversed(data.index):
print(idx, data.loc[idx, 'Even'], data.loc[idx, 'Odd'])
or
for idx in reversed(data.index):
print(idx, data.Even[idx], data.Odd[idx]...
symbolic link: find all files that link to this file
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Find the inode number of the file and then search for all files with the same inode number:
$ ls -i foo.txt
41525360 foo.txt
$ find . -follow -inum 41525360
Alternatively, try the lname option of find, but this won't work if you have relative symlinks e.g. a -> ../foo...
Is there a zip-like function that pads to longest length in Python?
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For Python 2.6x use itertools module's izip_longest.
For Python 3 use zip_longest instead (no leading i).
>>> list(itertools.izip_longest(a, b, c))
[('a1', 'b1', 'c1'), (None, 'b2', 'c2'), (None, 'b3', None)]
...
Twig for loop for arrays with keys
...
I found the answer :
{% for key,value in array_path %}
Key : {{ key }}
Value : {{ value }}
{% endfor %}
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What does the 'L' in front a string mean in C++?
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It's a wchar_t literal, for extended character set. Wikipedia has a little discussion on this topic, and c++ examples.
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How to debug Apache mod_rewrite
... Pro tip: Remember to turn your rewrite logging off. If you forget you'll fill your hard disk up fairly promptly, especially on a production server.
– John Hunt
May 21 '15 at 15:18
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extra qualification error in C++
...qualified name (a name with a namespace qualification), and such a name is forbidden as a method name in a class.
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How do you suppress output in IPython Notebook?
... %%capture is only enabled until the end of the cell, and it must appear before any code in the cell. (So it appears there isn't a way to uncapture within a cell.)
– Arel
Oct 17 '16 at 19:32
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