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How to use concerns in Rails 4
... models and avoid them getting too fat and messy.
As an example, I'll put one well known pattern, the taggable pattern:
# app/models/product.rb
class Product
include Taggable
...
end
# app/models/concerns/taggable.rb
# notice that the file name has to match the module name
# (applying Rails...
python: how to identify if a variable is an array or a scalar
...you say so, that would be very kind to explain why, maybe I'm not the only one to wonder why it should be avoided.
– Olivier Pons
May 30 '17 at 7:50
1
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Received fatal alert: handshake_failure through SSLHandshakeException
...e HttpsURLConnection class, or any HTTP Client library like Apache HttpComponents Client).
Most these client classes/libraries would rely on the trust store used by the JVM for certificate validation. In most cases, this will be the cacerts file in the JRE_HOME/lib/security directory. If the locati...
“Public key certificate and private key doesn't match” when using Godaddy issued certificate [closed
...
@felby Should mark this one as the accepted answer. This is the only answer that does not create an SSL trust issue with iOS devices.
– Noel Baron
Jul 11 '15 at 11:26
...
Where to place $PATH variable assertions in zsh?
...be using (i.e. .zshenv which does not currently exist in my installation), one of the ones I am currently using, or does it even matter?
There's a bunch of files read on startup (check the linked man pages), and there's a reason for that - each file has it's particular place (settings for every us...
SQL Call Stored Procedure for each Row without using a cursor
How can one call a stored procedure for each row in a table, where the columns of a row are input parameters to the sp without using a Cursor?
...
python pandas remove duplicate columns
...
There's a one line solution to the problem. This applies if some column names are duplicated and you wish to remove them:
df = df.loc[:,~df.columns.duplicated()]
How it works:
Suppose the columns of the data frame are ['alpha','bet...
Why are only final variables accessible in anonymous class?
...ype... anything like that. Basically it's a bit like communicating between one method and another: changes made to the parameters of one method aren't seen by its caller, but changes made to the objects referred to by the parameters are seen.
If you're interested in a more detailed comparison betwe...
The type or namespace name 'DbContext' could not be found [closed]
...
Thanks for your help. I hope Microsoft would one day make installation of their own software on their windows easier! It is amazing how many places one has to go to to figure what is needed and how they all fit together. NuGet, MS Download site, Message boards, books,.....
How to specialize std::hash::operator() for user-defined type in unordered containers?
... std::unordered_set<Key> and std::unordered_map<Key, Value>
one has to provide operator==(Key, Key) and a hash functor:
...