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Rails 3 check if attribute changed
...ributes with their original and new values (in an array).
You can check APIDock for which versions supported these methods.
http://apidock.com/rails/ActiveModel/Dirty
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Postgres: clear entire database before re-creating / re-populating from bash script
...need a backup of the database dumped onto disk in a plain-text .sql script file format, you could connect pg_dump and pg_restore directly together over a pipe.
To drop and recreate tables, you could use the --clean command-line option for pg_dump to emit SQL commands to clean (drop) database object...
Ways to eliminate switch in code [closed]
...ing it is a little hard to read (because one has to switch between several files to completely understand it)
– rshimoda
Oct 29 '08 at 23:51
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C# “as” cast vs classic cast [duplicate]
...ssembled" mean? Exceptions do not always represent an unexpected state. Is FileNotFoundException always an unexpected state?
– meir
May 11 '12 at 12:40
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Programmatically fire button click event?
...ode, not manually as a user. Is it possible in iOS development? Please provide your suggestions and guide me how to do that.
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What is PostgreSQL explain telling me exactly?
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I am mystified why people think slide decks make good technical documentation. A video of the talk might be helpful, but the information density of that slide deck is very close to zero. In the first six slides (1/5th of the total), there is exactly 1 sentenc...
What is the difference between a database and a data warehouse?
...ue. OLTP, again, is a TYPE of database.
Other types of "databases": Text files, XML, Excel, CSV..., Flat Files :-)
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What is the difference between the kernel space and the user space?
...d out, and thus have arbitrary hardware accesses.
Otherwise, for example, file permissions would be useless if any program could directly read from disk.
More precisely thanks to Michael Petch: it is actually possible for the OS to allow IO instructions on ring 3, this is actually controlled by th...
Android update activity UI from service
...here is new task, I want to refresh the activity UI to show that info.
I did find https://github.com/commonsguy/cw-andtutorials/tree/master/18-LocalService/ this example. Is that a good approch ? Any other examples?
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Wrap long lines in Python [duplicate]
...ion cause line breaks to be entered if I intend to put this text in a .csv file or other output file format besides the terminal? My fear is that I'll numerous lines when I expected only 1.
– Chris
Jun 28 '16 at 13:55
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