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How to check if object property exists with a variable holding the property name?
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The "in" operator does not work with strings. e.g. 'length' in 'qqq' will produce an exception. So if you want a general purpose check you need to use hasOwnProperty.
– Jacob
Jun 19 '14 at 17:55
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Is there any difference between DECIMAL and NUMERIC in SQL Server?
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They are the same. Numeric is functionally equivalent to decimal.
MSDN: decimal and numeric
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ModelState.AddModelError - How can I add an error that isn't for a property?
...than one of it's properties, as usual you call:
ModelState.AddModelError(string key, string errorMessage);
but use an empty string for the key:
ModelState.AddModelError(string.Empty, "There is something wrong with Foo.");
The error message will present itself in the <%: Html.ValidationSumm...
Move all files except one
How can I move all files except one? I am looking for something like:
14 Answers
14
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Rails: How do I create a default value for attributes in Rails activerecord's model? [duplicate]
... default option for the column in the migration
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add_column :status, :string, :default => "P"
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OR
You can use a callback, before_save
class Task < ActiveRecord::Base
before_save :default_values
def default_values
self.status ||= 'P' # note self.status = 'P' if self.status....
Different types of thread-safe Sets in Java
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1) The CopyOnWriteArraySet is a quite simple implementation - it basically has a list of elements in an array, and when changing the list, it copies the array. Iterations and other accesses which are running at this time continue with the old array, avoiding necessity of synchronization between...
\r\n, \r and \n what is the difference between them? [duplicate]
I need to ask about the difference in a string between \r\n , \r and \n . How is a string affected by each?
4 Answers
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Spring MVC type conversion : PropertyEditor or Converter?
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In my mind, PropertyEditors are limited in scope - they help convert String to a type, and this string typically comes from UI, and so registering a PropertyEditor using @InitBinder and using WebDataBinder makes sense.
Converter on the other hand is more generic, it is intended for ANY conve...
How do I do a Date comparison in Javascript? [duplicate]
...t than B.
But it sounds like what you're having trouble with is turning a string into a date. You do that by simply passing the string as an argument for a new Date:
var someDate = new Date("12/03/2008");
or, if the string you want is the value of a form field, as it seems it might be:
var some...
How to compare versions in Ruby?
How to write a piece of code to compare some versions strings and get the newest?
8 Answers
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