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Validate uniqueness of multiple columns
Is there a rails-way way to validate that an actual record is unique and not just a column? For example, a friendship model / table should not be able to have multiple identical records like:
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What's the best way to check if a file exists in C?
Is there a better way than simply trying to open the file?
9 Answers
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How to remove a key from Hash and get the remaining hash in Ruby/Rails?
To add a new pair to Hash I do:
14 Answers
14
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creating a random number using MYSQL
I would like to know is there a way to select randomly generated number between 100 and 500 along with a select query.
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An efficient way to transpose a file in Bash
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29 Answers
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How to pretty print nested dictionaries?
How can I pretty print a dictionary with depth of ~4 in Python? I tried pretty printing with pprint() , but it did not work:
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How do I drop table variables in SQL-Server? Should I even do this?
I have a table variable in a script (not a stored procedure). Two questions:
6 Answers
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Difference between ApiController and Controller in ASP.NET MVC
I've been playing around with ASP.NET MVC 4 beta and I see two types of controllers now: ApiController and Controller .
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RabbitMQ / AMQP: single queue, multiple consumers for same message?
I am just starting to use RabbitMQ and AMQP in general.
12 Answers
12
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Changing font size and direction of axes text in ggplot2
I am plotting a graph with a categorical variable on the x axis and a numerical variable on the y axis.
7 Answers
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