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How to run `rails generate scaffold` when the model already exists?
...cessary controller and migration files by using the rails generate option. If you run rails generate -h you can see all of the options available to you.
Rails:
controller
generator
helper
integration_test
mailer
migration
model
observer
performance_test
plugin
resource
scaff...
Why there is no ConcurrentHashSet against ConcurrentHashMap
...etFromMap which required you to pass in an empty map object. But it is specific to ConcurrentHashMap.
Anyway, the Java designers could have created a new set interface every time a new map interface was created, but that pattern would be impossible to enforce when third parties create their own map...
csv.Error: iterator should return strings, not bytes
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You open the file in text mode.
More specifically:
ifile = open('sample.csv', "rt", encoding=<theencodingofthefile>)
Good guesses for encoding is "ascii" and "utf8". You can also leave the encoding off, and it will use the system default encoding, which t...
Is there a better way to iterate over two lists, getting one element from each list for each iterati
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what if additionally I want the index i? Can I wrap that zip in enumerate?
– Charlie Parker
Mar 6 '18 at 18:06
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Immediate Child selector in LESS
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I wouldn't doubt that it's a bug if it doesn't work with a space there, unless it's specifically documented.
– BoltClock♦
Nov 13 '11 at 8:15
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Right way to reverse pandas.DataFrame?
...index[::-1])
or simply:
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.Ev...
What's the function like sum() but for multiplication? product()?
... in Python 3, the reduce() function was moved to the functools module.
Specific case: Factorials
As a side note, the primary motivating use case for prod() is to compute factorials. We already have support for that in the math module:
>>> import math
>>> math.factorial(10)
362880...
Get the last inserted row ID (with SQL statement) [duplicate]
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If your SQL Server table has a column of type INT IDENTITY (or BIGINT IDENTITY), then you can get the latest inserted value using:
INSERT INTO dbo.YourTable(columns....)
VALUES(..........)
SELECT SCOPE_IDENTITY()
This ...
JQuery .each() backwards
... Should be important to note that the index is not reversed, so if you are only wanting to do the last three, for instance, you cannot expect <li>Item 5</li> to have an index of 0.
– pathfinder
Dec 10 '12 at 23:50
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Is there any way to view the currently mapped keys in Vim?
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Just for clarify, I believe :map, as the original question asks, just shows mappings made by plugins, vimrc, etc. If you want to see the default key bindings in vim, use :index
– Von
Mar 5 '14 at 13:...