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Removing a model in rails (reverse of “rails g model Title…”)
...igration. If you run 'destroy' on that model, it will delete the migration file, but not the database table. So before run
bundle exec rake db:rollback
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Object reference not set to an instance of an object.Why doesn't .NET show which object is `null`?
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Line numbers and source file names aren't stored in the IL code itself, either, or are they? Yet, they can be made available for debugging.
– O. R. Mapper
Feb 9 '13 at 12:00
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How to create JSON string in C#
... "my_password",
SourceDir = "/export/zip/mypath/",
FileName = "my_file.zip"
};
//Tranform it to Json object
string json_data = JsonConvert.SerializeObject(my_jsondata);
//Print the Json object
Console.WriteLine(json_data);
//...
Handling Touch Event in UILabel and hooking it up to an IBAction
...sponder. All UIresponder objects can handle touch events. So in your class file which knows about your view (which contains the UIlabel) implement:
-(void)touchesBegan:(NSSet*)touches withEvent:(UIEvent*)event;
In interface builder set the UILabel's tag value. when touches occur in your touchesB...
How to save picture to iPhone photo library?
...wered Sep 21 '10 at 13:53
Denis FileevDenis Fileev
71855 silver badges77 bronze badges
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PostgreSQL: Drop PostgreSQL database through command line [closed]
...es yourself now connected? If so, you might have to edit your pg_hba.conf file to reject connections from other users, or shut down whatever app is accessing the pg database to be able to drop it. I have this problem on occasion in production. Set pg_hba.conf to have a two lines like this:
local...
When do I need to use Begin / End Blocks and the Go keyword in SQL Server?
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Also, if you are doing an install script, and have several batches in one file, an error in one batch will not keep the script from continuing to run, which may leave a mess. (Always backup before installing.)
Related to what Dave Markel pointed out, there are cases when parsing will fail because ...
Detecting taps on attributed text in a UITextView in iOS
...t values you want to store in the attributed text range.
Add a new swift file with File > New > File... > iOS > Source > Swift File. You can call it what you want. I am calling mine NSAttributedStringKey+CustomAttribute.swift.
Paste in the following code:
import Foundation
extens...
How can I use a Python script in the command line without cd-ing to its directory? Is it the PYTHONP
...n I make any use of PYTHONPATH? When I try to run a script in the path the file is not
found. When I cd to the directory holding the script the script runs. So what good is the
PYTHONPATH?
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Coloring white space in git-diff's output
...rt-hand for
old,new,context.
git diff --ws-error-highlight=new,old <file>
or
git diff --ws-error-highlight=all <file>
I don't know of a way to permanently turn this on and store this in config aside from using an alias:
git config alias.df 'diff --ws-error-highlight=all'
Now you...