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mongoDB/mongoose: unique if not null
...ngoDB v1.8+ you can get the desired behavior of ensuring unique values but allowing multiple docs without the field by setting the sparse option to true when defining the index. As in:
email : {type: String, trim: true, index: true, unique: true, sparse: true}
Or in the shell:
db.users.ensureIn...
git-svn not a git command?
...n. See this SO question.
Update: with a modern (2017) Git for Windows 2.x, git svn is already included.
No need for sudo apt-get install git-svn, which would only be possible in a WSL (Windows Subsystem for Linux) shell session anyway.
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Get itunes link for app before submitting
...Store for your apps and company: developer.apple.com/library/ios/qa/qa1633/_index.html
– eldermao
Jun 22 '14 at 6:19
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Converting Integer to Long
...at the method's actually returning. That wouldn't work for a double[] for example, but would work for a Double[].
– Jon Skeet
Jul 14 '11 at 9:40
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Performant Entity Serialization: BSON vs MessagePack (vs JSON)
...k is designed to be transparently converted from/to JSON.
MessagePack is smaller than BSON
MessagePack's format is less verbose than BSON. As the result, MessagePack can serialize objects smaller than BSON.
For example, a simple map {"a":1, "b":2} is serialized in 7 bytes with MessagePack, while B...
How to show the loading indicator in the top status bar
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For Swift syntax use UIApplication.sharedApplication().networkActivityIndicatorVisible = true
– moraisandre
Feb 4 '16 at 3:42
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Simple conversion between java.util.Date and XMLGregorianCalendar
...orianCalendar.setTime() will not return anything.
– f_puras
Sep 12 '14 at 8:56
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How to create PDFs in an Android app? [closed]
... @kape123 nice sense of humour :-)
– AZ_
Feb 7 '13 at 12:35
10
CommonsWare generic ...
Save plot to image file instead of displaying it using Matplotlib
...able, whitespace around the image. Remove it with:
savefig('foo.png', bbox_inches='tight')
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Uninitialized constant ActiveSupport::Dependencies::Mutex (NameError)
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In case you can't upgrade to Ruby on Rails 2.3.11 (and to expand on douglasr's answer), thread must be required at the top of boot.rb. For example:
require 'thread'
# Don't change this file!
# Configure your app in config/environment.rb and config/environments/*.rb
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