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Delete a key from a MongoDB document using Mongoose
... can do:
User.update({_id: user._id}, {$unset: {field: 1 }}, callback);
And since version 2.4, if you have an instance of a model already you can do:
doc.field = undefined;
doc.save(callback);
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Android 'Unable to add window — token null is not for an application' exception
I get the following Android exception when I try to open a dialog. Can someone please help me understand what is going on and how can I fix this problem?
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C/C++ maximum stack size of program
...nment variable in the OS. You can then check the stack size with ulimit -s and set it to a new value with for example ulimit -s 16384.
Here's a link with default stack sizes for gcc.
DFS without recursion:
std::stack<Node> dfs;
dfs.push(start);
do {
Node top = dfs.top();
if (top is ...
What is the difference between a.getClass() and A.class in Java?
...oth in different circumstances (just like there are with Class.forName() and ClassLoader.loadClass() .
7 Answers
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Truststore and Keystore Definitions
What's the difference between a keystore and a truststore?
6 Answers
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Installing PIL with pip
I am trying to install PIL (the Python Imaging Library) using the command:
21 Answers
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How to update Ruby to 1.9.x on Mac?
I have created a new user account on my mac and I am trying to update to the current version of ruby on it (1.9.2) from the snow leopard default of 1.8.7. Can somebody point me to tutorial or explain the best method to update Ruby on my mac from 1.8 to 1.9.2? Thanks
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Handler vs AsyncTask
I'm confused as to when one would choose AsyncTask over a Handler. Say I have some code I want to run every n seconds which will update the UI. Why would I choose one over the other?
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How to add an integer to each element in a list?
If I have list=[1,2,3] and I want to add 1 to each element to get the output [2,3,4] ,
how would I do that?
11 Answers...
How to cherry pick only changes for only one file, not the whole commit
...le. So if you added a line in a commit, but previous commits changed more, and you only want to add that line without those other changes, then a checkout is not what you want.
Otherwise if you want to apply the patch introduced in a commit to only a single file, you have multiple options. You coul...