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Rails: select unique values from a column
...rails 5+
Model.distinct.pluck(:rating)
Update
Apparently, as of rails 5.0.0.1, it works only on "top level" queries, like above. Doesn't work on collection proxies ("has_many" relations, for example).
Address.distinct.pluck(:city) # => ['Moscow']
user.addresses.distinct.pluck(:city) # => [...
What is the command to truncate a SQL Server log file?
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130
if I remember well... in query analyzer or equivalent:
BACKUP LOG databasename WITH TRUNCATE_...
Error: Could not find or load main class [duplicate]
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Sae1962
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answered Sep 20 '11 at 13:16
SaketSaket
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‘ld: warning: directory not found for option’
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30 Answers
30
Active
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How to sort a list of strings?
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skolima
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answered Aug 30 '08 at 17:10
Eli CourtwrightEli Courtwright
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removeEventListener on anonymous functions in JavaScript
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Adam HeathAdam Heath
4,20111 gold badge3232 silver badges4949 bronze badges
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How to detect input type=file “change” for the same file?
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answered Nov 7 '10 at 15:14
BrunoLMBrunoLM
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Python multiprocessing PicklingError: Can't pickle
...strap_inner
self.run()
File "/usr/lib/python2.7/threading.py", line 505, in run
self.__target(*self.__args, **self.__kwargs)
File "/usr/lib/python2.7/multiprocessing/pool.py", line 315, in _handle_tasks
put(task)
PicklingError: Can't pickle <type 'function'>: attribute lookup _...
Using link_to with embedded HTML
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260
Two ways. Either:
<%= link_to user_path(@user) do %>
<i class="icon-ok icon-white"&g...
How to fix “containing working copy admin area is missing” in SVN?
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According to this: http://www.devcha.com/2008/03/svn-directory-svn-containing-working.html
Check-out the folder "blabla" to a different location and then copy its .svn folder back into the original "blabla".
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