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Ruby on Rails: How can I revert a migration with rake db:migrate?
...you want to revert.
eg. if you want to revert a migration with file name 3846656238_create_users.rb
rake db:migrate:down VERSION=3846656238
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Fastest way to convert an iterator to a list
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edited Sep 25 '10 at 18:41
answered Sep 24 '10 at 20:48
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How exactly does a generator comprehension work?
... it's a generator object
<generator object <genexpr> at 0x7f2ad75f89e0>
>>> len(filtered_gen) # So technically, it has no length
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: object of type 'generator' has no len()
>>> #...
using awk with column value conditions
...avisRob Davis
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How to suppress Pandas Future warning ?
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edited Feb 20 at 8:37
smci
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answered A...
How to have the cp command create any necessary folders for copying a file to a destination [duplica
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Sass negative variable value?
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answered Nov 8 '12 at 19:44
Zoltan TothZoltan Toth
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How to find out which fonts are referenced and which are embedded in a PDF document
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CAAAAA+Tahoma TrueType yes yes yes 28 0
DAAAAA+Wingdings-Regular TrueType yes yes yes 43 0
EAAAAA+Webdings TrueType yes yes yes 38 0
FAAAAA+Arial-BoldMT TrueType yes yes yes...
std::next_permutation Implementation Explanation
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edited Jan 14 '16 at 23:58
Jamie
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answered Jul 14 '12 at 11:32...
Convert list to tuple in Python
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843
It should work fine. Don't use tuple, list or other special names as a variable name. It's pro...