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Include all existing fields and add new fields to document
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In 4.2+, you can use the $set aggregation pipeline operator which is nothing other than an alias to $addFieldsadded in 3.4
The $addFields stage is equivalent to a $project stage that explicitly specifies all existing fields i...
Why do most fields (class members) in Android tutorial start with `m`?
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answered Aug 16 '11 at 2:09
xiaobing.zhaoxiaobing.zhao
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How to efficiently build a tree from a flat structure?
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123
Store IDs of the objects in a hash table mapping to the specific object. Enumerate through all ...
Check if object is file-like in Python
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edited Aug 10 '10 at 20:34
answered Nov 2 '09 at 13:29
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Check if URL has certain string with PHP
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228
Try something like this. The first row builds your URL and the rest check if it contains the w...
How do I add more members to my ENUM-type column in MySQL?
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ALTER TABLE
`table_name`
MODIFY COLUMN
`column_name2` enum(
'existing_value1',
'existing_value2',
'new_value1',
'new_value2'
)
NOT NULL AFTER `column_name1`;
share...
Cannot deserialize the JSON array (e.g. [1,2,3]) into type ' ' because type requires JSON object (e.
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edited Jun 1 '15 at 11:52
answered Mar 21 '14 at 11:40
ha...
How to loop backwards in python? [duplicate]
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302
range() and xrange() take a third parameter that specifies a step. So you can do the following.
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Determine if a function exists in bash
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gaRex
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answered Sep 17 '08 at 18:00
JBBJBB
3,857...
Delegates: Predicate vs. Action vs. Func
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answered Feb 19 '09 at 21:22
Jon SkeetJon Skeet
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