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What is attr_accessor in Ruby?

I am having a hard time understanding attr_accessor in Ruby . Can someone explain this to me? 19 Answers ...
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What is Data Transfer Object?

... If I have model A and I need to pass it to two subsystems will there be A_DTO_1 and A_DTO_2 with the relevant fields of each? "DTOs can be to encapsulate parameters for method calls" --> So every class that wraps parameters is DTO even if this is not distributed system? Are't models in MVC th...
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Entity Framework - Include Multiple Levels of Properties

...x you can get (this is all one statement!): viewModel.Instructors = await _context.Instructors .Include(i => i.OfficeAssignment) .Include(i => i.CourseAssignments) .ThenInclude(i => i.Course) .ThenInclude(i => i.Enrollments) .ThenInclude...
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How to test that no exception is thrown?

...write, will work. Such a method call can look like this: existingUserById_ShouldReturn_UserObject. If this method fails (e.g.: an exception is thrown) then you know something went wrong and you can start digging. By adding another test (nonExistingUserById_ShouldThrow_IllegalArgumentException) th...
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Can I control the location of .NET user settings to avoid losing settings on application upgrade?

...[Local Settings\]Application Data\<companyname>\<appdomainname>_<eid>_<hash>\<verison> <c:\Documents and Settings> is the user data directory, either non-roaming (Local Settings above) or roaming. <username> is the user name. <companyname> is the Com...
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Should I use the datetime or timestamp data type in MySQL?

...native format. You can do calculations within MySQL that way ("SELECT DATE_ADD(my_datetime, INTERVAL 1 DAY)") and it is simple to change the format of the value to a UNIX timestamp ("SELECT UNIX_TIMESTAMP(my_datetime)") when you query the record if you want to operate on it with PHP. ...
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What are the differences between Perl, Python, AWK and sed? [closed]

...th an ⁿ of 1,000,000 it runs in less than two seconds. time perl -E '$x=1_000_000;$_="a"x$x;$m=("a??"x$x).("a"x$x);say $_=~$m' If you run the naive one it takes more than two seconds for an ⁿ of just 25. The thing you have to realize is Perl has more regex features than those faster ones includi...
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jQuery $(document).ready and UpdatePanels?

...ally }); var prm = Sys.WebForms.PageRequestManager.getInstance(); prm.add_endRequest(function() { // re-bind your jQuery events here }); The PageRequestManager is a javascript object which is automatically available if an update panel is on the page. You shouldn't need to do anything other t...
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Bootstrap with jQuery Validation Plugin

...After(element); } } }); See Example: http://jsfiddle.net/mapb_1990/hTPY7/7/ share | improve this answer | follow | ...
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How can I pass a list as a command-line argument with argparse?

...depending on how you want the user interface to behave). nargs parser.add_argument('-l','--list', nargs='+', help='<Required> Set flag', required=True) # Use like: # python arg.py -l 1234 2345 3456 4567 nargs='+' takes 1 or more arguments, nargs='*' takes zero or more. append parser.add_...