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How to drop columns using Rails migration
... AddXXXtoTTT an RemoveXXXFromTTT may be followed by a white-spaced list of filed_name:data_type, and the appropriate add_column and remove_column statements will be created: rails g migration RemoveUnusefulFieldsFromUsers hair_color:string favorite_number:integer removes two attributes using a singl...
Website screenshots
...re any way of taking a screenshot of a website in PHP, then saving it to a file?
26 Answers
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How to break out from a ruby block?
...he block again:
f.each do |line| # Iterate over the lines in file f
next if line[0,1] == "#" # If this line is a comment, go to the next
puts eval(line)
end
When used in a block, break transfers control out of the block, out of the iterator that invoked the block, and to the f...
json_encode is returning NULL?
...ables are in UTF-8, but not entered data. For example the input was in txt file, but created on Win machine with stupid encoding (in my case Win-1250 = CP1250) and this data has been entered into the DB.
Solution? Look for new data (excel, web page), edit source txt file via PSPad (or whatever else...
Service Reference Error: Failed to generate code for the service reference
...ed configurations from the class library's app.config to the configuration file of the startup project.
If there are types defined in local assemblies that need to be reused in the service client, those assemblies simply need to be referenced from the above mentioned class library project, along wi...
Should I compile release builds with debug info as “full” or “pdb-only”?
...is reasonable given your product & customers.
Be sure to save the PDB files somewhere so that you can reference them when a crash report comes in. If you can set up a symbol server to store those debugging symbols, so much the better.
If you opt to build with none, you will have no recourse w...
What is “Orthogonality”?
... getting the contents of a disk (dd), another for filtering lines from the file (grep), another for writing those lines to a file (cat), etc. These can all be mixed and matched at will.
share
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imp...
Setting up maven dependency for SQL Server
... Olaf and add it to your local Maven repository with;
mvn install:install-file -Dfile=sqljdbc4.jar -DgroupId=com.microsoft.sqlserver -DartifactId=sqljdbc4 -Dversion=4.0 -Dpackaging=jar
Then add it to your project with;
<dependency>
<groupId>com.microsoft.sqlserver</groupId>
...
How to find which rspec test is taking so long
...
In RSpec 2 and 3, you can use the --profile flag or add --profile to your .rspec file. This will track the top 10 slowest examples.
For RSpec 1, you can use --format o with spec command. It shows a text-based progress bar with profiling of 10 slowest examples. Fo...
How to explain dependency injection to a 5-year-old? [closed]
.... Most of the frameworks allow you to do this by specifying in an external file, what object is to be injected.
Assume a properties file for a fictitious dependency injector:
#mock employee
employee.address = MockAddress.class
employee.department = MockDepartment.class
#production setup
...