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How can I filter a Django query with a list of values?
...ble values from the list then you can't use =.
The sql query will be like SELECT * FROM mytable WHERE ids=[1, 3, 6, 7, 9] which is not true. You have to use in operator for this so you query will be like SELECT * FROM mytable WHERE ids in (1, 3, 6, 7, 9) for that Django provide __in operator.
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Elegant way to invert a map in Scala
...Int,String] = Map(1 -> d, 2 -> b, 3 -> c)
To avoid this you can convert your map to a list of tuples first, then invert, so that you don't drop any duplicate values:
scala> val i = m.toList.map({ case(k , v) => v -> k})
i: List[(Int, String)] = List((1,a), (2,b), (3,c), (1,d))
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Why is there no tuple comprehension in Python?
... into a smaller one by iterating over the attrs that you are interested in converting to a tuple record.
– dave
Jul 1 '16 at 13:37
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Checking if a key exists in a JavaScript object?
... if a property is present in a javascript object:
!!obj.theProperty
Will convert value to bool. returns true for all but the false value
'theProperty' in obj
Will return true if the property exists, no matter its value (even empty)
obj.hasOwnProperty('theProperty')
Does not check the prototype cha...
What is the use of hashCode in Java?
... distinct integers for distinct objects. (This is typically implemented by converting the internal address of the object into an integer, but this implementation technique is not required by the Java programming language.)
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Which HTTP methods match up to which CRUD methods?
...est HTTP verbs are GET, POST, PATCH, PUT and DELETE
Overview
HTTP GET - SELECT/Request
HTTP PUT - UPDATE
HTTP POST - INSERT/Create
HTTP PATCH - When PUTting a complete resource representation is cumbersome and utilizes more bandwidth, e.g.: when you have to update partially a column
HTTP DELETE ...
jQuery posting JSON
...ype : 'POST',
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if you pass an object as settings.data jQuery will convert it to query parameters and by default send with the data type application/x-www-form-urlencoded; charset=UTF-8, probably not what you want
sh...
How to prevent Node.js from exiting while waiting for a callback?
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I guess he means that if the library has converted code that once was synchronous to a new asynchronous version, it's possible that the library creators forgot to queue the callbacks and the event queues get emptied somewhere in the middle of your execution, thus fi...
Unable to verify leaf signature
...ssl x509 -inform DER -in YOUR_CERTIFICATE.cer -out YOUR_CERTIFICATE.crt to convert it t a .crt beforehand
– 0x1gene
Oct 26 '16 at 14:49
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Difference between constituency parser and dependency parser
...eterministic (rule-based) transformation on the constituency parse tree to convert it into a dependency tree.
More can be found here:
http://en.wikipedia.org/wiki/Phrase_structure_grammar
http://en.wikipedia.org/wiki/Dependency_grammar
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