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When to add what indexes in a table in Rails
...o two foreign keys at once (add_index (:users, [:category_id, :state_id]), what happens? How is this different from adding the index for each key?
Then the index is a combined index of the two columns. That doesn't make any sense, unless you want all entries for one category_id AND one state_id (...
Avoiding SQL injection without parameters
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I think the correct answer is:
Don't try to do security yourself. Use whatever trusted, industry standard library there is available for what you're trying to do, rather than trying to do it yourself. Whatever assumptions you make about security, might be incorrect. As secure as your own approa...
Differences between fork and exec
What are the differences between fork and exec ?
9 Answers
9
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Create directories using make file
...to create the directory if it does not exist. The 'as amended' version is what I had in mind last night - but both techniques work (and both have problems if output/debug exists but is a file rather than a directory).
share...
Typical AngularJS workflow and project structure (with Python Flask)
...t feels more natural to me than either Knockout, Ember or Backbone. Anyway what is the workflow like? Do people start with developing a client-side application in AngularJS and then hooking up the back-end to it?
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How do I disable orientation change on Android?
...oardHidden|orientation" to your AndroidManifest.xml. This tells the system what configuration changes you are going to handle yourself - in this case by doing nothing.
<activity android:name="MainActivity"
android:screenOrientation="portrait"
android:configChanges="keyboardHidden|orien...
Using Pairs or 2-tuples in Java [duplicate]
My Hashtable in Java would benefit from a value having a tuple structure. What data structure can I use in Java to do that?
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CoffeeScript, When to use fat arrow (=>) over arrow (->) and vice versa
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What do you do when you want to use the this that would be called from the thin arrow, but also the instance variables that you would get with the fat arrow?
– Andrew Mao
Sep 21 '12 at 2...
C/C++ check if one bit is set in, i.e. int variable
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Hm. Why is this starting from 0? What do we get when 1 << 0?? Sorry, confused.
– Danijel
Feb 1 '16 at 14:59
6
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Deserialize JSON into C# dynamic object?
...ject)); saying that no overload for method with 2 arguments..wrong dll or what?
– Stewie Griffin
Jun 18 '11 at 20:17
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