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Convert Time from one time zone to another in Rails
...ious reply it's suggested to use a before_filter to set the timezone temporally.
You should never, ever do that because Time.zone stores the information in the thread, and it will probably leak to the next request handled by that thread.
Instead you should use an around_filter to make sure that t...
AngularJS ng-if with multiple conditions
... If I have 20 input fields and I have to enable submit button only if all fields are filled. In this case, I have to include so many conditions. This is little bit confusing. Is there any other feasible solution?
– Mr_Perfect
Dec 2 '16 at 5:14
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What do Clustered and Non clustered index actually mean?
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With a clustered index the rows are stored physically on the disk in the same order as the index. Therefore, there can be only one clustered index.
With a non clustered index there is a second list that has pointers to the physical rows. You can have many non clustered ind...
How do I delete a fixed number of rows with sorting in PostgreSQL?
...erm row identifier.
There's also oid but that only exists if you specifically ask for it when you create the table.
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Bubble Sort Homework
...cient or readable.
In the for loop, you use the variable element. Technically, element is not an element; it's a number representing a list index. Also, it's quite long. In these cases, just use a temporary variable name, like i for "index".
for i in range(0, length):
The range command can also ...
How to add an auto-incrementing primary key to an existing table, in PostgreSQL?
...of PostgreSQL
In old versions of PostgreSQL (prior to 8.x?) you had to do all the dirty work. The following sequence of commands should do the trick:
ALTER TABLE test1 ADD COLUMN id INTEGER;
CREATE SEQUENCE test_id_seq OWNED BY test1.id;
ALTER TABLE test ALTER COLUMN id SET DEFAULT nextval('...
Version of SQLite used in Android?
...rt it.
Note: if you want your app to use the same version of SQLite across all Android versions, consider using this 3rd party SQLite support library.
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Revert to a commit by a SHA hash in Git? [duplicate]
...ample, I want to revert to a commit six commits behind the head, reverting all the changes in the intermediary commits in between.
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“You are on a branch yet to be born” when adding git submodule
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I've verified all of these things. When I check out the desired repo to another directory, it has many files, and a master branch. The repo I am trying to add this one to as a submodule is on the master branch, has no obvious problems (sta...
How to discover number of *logical* cores on Mac OS X?
...id-2011 1.7GHz MacBook Air, this command says 4. However, I suspected it really only has 2 cores, and system_profiler SPHardwareDataType seems to agree. Can you explain the discrepancy?
– Joshua Flanagan
Sep 24 '11 at 1:42
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