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MongoDB: Find a document by non-existence of a field?

...operator: db.mycollection.find({ "price" : { "$exists" : false } }) and see its documentation. share | improve this answer | follow | ...
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Is there a function to deselect all text using JavaScript?

...elements. For form-fields (like textarea), this method doesn't work in IE9 and FF5. – Šime Vidas Jul 3 '11 at 13:37 1 ...
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How can I have grep not print out 'No such file or directory' errors?

I'm grepping through a large pile of code managed by git, and whenever I do a grep, I see piles and piles of messages of the form: ...
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Python Empty Generator Function

... return once in a generator; it stops iteration without yielding anything, and thus provides an explicit alternative to letting the function run out of scope. So use yield to turn the function into a generator, but precede it with return to terminate the generator before yielding anything. >>...
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What does inverse_of do? What SQL does it generate?

I'm trying to get my head around inverse_of and I do not get it. 8 Answers 8 ...
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When should a class be Comparable and/or Comparator?

I have seen classes which implement both Comparable and Comparator . What does this mean? Why would I use one over the other? ...
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How can I keep my fork in sync without adding a separate remote?

...forked it. Click on Create pull request: Give the pull request a title and maybe a description and click Create pull request. On the next page, scroll to the bottom of the page and click Merge pull request and Confirm merge. Your Git repository me/foobar will be updated. Edit: rebase options ...
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Modern way to filter STL container?

...std::copy_if evaluates the lambda expression for every element in foo here and if it returns true it copies the value to bar. The std::back_inserter allows us to actually insert new elements at the end of bar (using push_back()) with an iterator without having to resize it to the required size firs...
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WWW or not WWW, what to choose as primary site name? [closed]

From technical perspective the only issue is traffic and incoming links (one of them should redirect to another). 14 Answe...
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What is the status of JSR 305?

...ion JSR305 vs. JSR308 (Java Type Anotations) - Which is going to be the standard? and I understand the difference between JSR 308 and JSR 305 . ...