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Add timestamps to an existing table
...umns by specifying the column types manually:
class AddTimestampsToUser < ActiveRecord::Migration
def change_table
add_column :users, :created_at, :datetime, null: false
add_column :users, :updated_at, :datetime, null: false
end
end
While this does not have the same terse syntax a...
python exception message capturing
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As an alternative for logging exception you could use logger.exception(e) instead. It will log the exception with traceback at the same logging.ERROR level.
– mbdevpl
Aug 31 '16 at 9:50
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How do I access my SSH public key?
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Copy the key to your clipboard.
$ pbcopy < ~/.ssh/id_rsa.pub
# Copies the contents of the id_rsa.pub file to your clipboard
Warning: it's important to copy the key exactly without adding
newlines or whitespace. Thankfully the pbcopy command makes it easy to
perf...
Where are my postgres *.conf files?
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they are in data directory... default user can't get there thus I couldn't find them.
– Timur Sadykov
Sep 1 '10 at 8:21
2
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Anyway to prevent the Blue highlighting of elements in Chrome when clicking quickly?
...een for example, Chrome will behave much like it does on Android. I had a <div> which would flash blue whenever you clicked somewhere inside it. Only when I used this answer did it stop. Thanks!
– Valorum
Jul 28 '16 at 20:37
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Can “list_display” in a Django ModelAdmin display attributes of ForeignKey fields?
... get_name.short_description = 'Author Name' #Renames column head
#Filtering on side - for some reason, this works
#list_filter = ['title', 'author__name']
admin.site.register(Book, BookAdmin)
For additional reference, see the Django model link here
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How do i find out what all symbols are exported from a shared object?
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Use: nm --demangle <libname>.so
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JSON parsing using Gson for Java
...nslations");
jobject = jarray.get(0).getAsJsonObject();
String result = jobject.get("translatedText").getAsString();
return result;
}
To make the use more generic - you will find that Gson's javadocs are pretty clear and helpful.
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How does BLAS get such extreme performance?
Out of curiosity I decided to benchmark my own matrix multiplication function versus the BLAS implementation... I was to say the least surprised at the result:
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Why does (1 in [1,0] == True) evaluate to False?
...e)
which is obviously False.
This also happens for expressions like
a < b < c
which translate to
(a < b) and (b < c)
(without evaluating b twice).
See the Python language documentation for further details.
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