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ActiveModel::ForbiddenAttributesError when creating new user
...put by seeing if your controller will respond to the following methods (in order):
create_params
<model_name>_params such as article_params (this is
the default convention in rails for naming your param method)
resource_params (a generically named method you could specify in
each controller)...
Using capistrano to deploy from different git branches
...
as stated by @lulalala I need to use lowercase -s in order for it to fetch the specified branch.
– Jahan
Dec 6 '13 at 23:35
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How to update PATH variable permanently from Windows command line?
...r updates.
Note that your application will need elevated admin rights in order to be able to modify this key.
You indicate in the comments that you would be happy to modify just the per-user environment. Do this by editing the values in HKEY_CURRENT_USER\Environment. As before, make sure that you...
When would anyone use a union? Is it a remnant from the C-only days?
...
enum BeesTypes { TYPE_B1, ..., TYPE_BN };
class A
{
private:
std::unordered_map<int, Bee> data; // C++11, otherwise use std::map
public:
Bee get(int); // the implementation is obvious: get from the unordered map
};
Then, to get the content of a union instance from data, you use a...
When to use reinterpret_cast?
...is true that reinterpret_cast is not portable because of one reason - byte order (endianness). But this is often surprisingly the best reason to use it. Let's imagine the example: you have to read binary 32bit number from file, and you know it is big endian. Your code has to be generic and works pro...
Android - Package Name convention
...l files while developing on android).
The reason for having it in reverse order is to do with the layout on the storage media. If you consider each period ('.') in the application name as a path separator, all applications from a publisher would sit together in the path hierarchy.
So, for instance,...
How are feature_importances in RandomForestClassifier determined?
...s a list of DecisionTreeClassifier (as mentioned in the documentation). In order to compute the feature_importances_ for the RandomForestClassifier, in scikit-learn's source code, it averages over all estimator's (all DecisionTreeClassifer's) feature_importances_ attributes in the ensemble.
In Deci...
Getting key with maximum value in dictionary?
... I thought dict is unsorted, couldn't d.keys and d.values theoretically be ordered differently?
– Dimath
Apr 1 '15 at 13:28
1
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Example for boost shared_mutex (multiple reads/one write)?
... the number of readers. Let each reader take one count of the semaphore in order to read, that way they can all read at the same time. Then let the writer take ALL the semaphore counts prior to writing. This causes the writer to wait for all reads to finish and then block out reads while writing.
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What's the difference between lists and tuples?
..., while lists are homogeneous sequences. Tuples have structure, lists have order.
Using this distinction makes code more explicit and understandable.
One example would be pairs of page and line number to reference locations in a book, e.g.:
my_location = (42, 11) # page number, line number
Yo...