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Delete a key from a MongoDB document using Mongoose
I'm using the Mongoose Library for accessing MongoDB with node.js
10 Answers
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Overriding a Rails default_scope
If I have an ActiveRecord::Base model with a default-scope:
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What is the difference between the add and offer methods in a Queue in Java?
Take the PriorityQueue for example http://java.sun.com/j2se/1.5.0/docs/api/java/util/PriorityQueue.html#offer(E)
8 Answe...
Sharing link on WhatsApp from mobile website (not application) for Android
I have developed a website which is mainly used in mobile phones.
I want to allow users to share information directly from the web page into WhatsApp.
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How can I check a C# variable is an empty string “” or null? [duplicate]
I am looking for the simplest way to do a check. I have a variable that can be equal to "" or null. Is there just one function that can check if it's not "" or null?
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How do I add a placeholder on a CharField in Django?
Take this very simple form for example:
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TSQL - How to use GO inside of a BEGIN .. END block?
I am generating a script for automatically migrating changes from multiple development databases to staging/production. Basically, it takes a bunch of change-scripts, and merges them into a single script, wrapping each script in a IF whatever BEGIN ... END statement.
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Convert light frequency to RGB?
Does anyone know of any formula for converting a light frequency to an RGB value?
9 Answers
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Selecting/excluding sets of columns in pandas [duplicate]
I would like to create views or dataframes from an existing dataframe based on column selections.
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Performance of static methods vs instance methods
My question is relating to the performance characteristics of static methods vs instance methods and their scalability. Assume for this scenario that all class definitions are in a single assembly and that multiple discrete pointer types are required.
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