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How do I make a column unique and index it in a Ruby on Rails migration?
I would like to make a column unique in Ruby on Rails migration script. What is the best way to do it? Also is there a way to index a column in a table?
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Rails 3 datatypes?
...ly identify each row in a table
string - is for small data types such as a title. (Should you choose string or text?)
text - is for longer pieces of textual data, such as a paragraph of information.
time - is for time only
timestamp - for storing date and time into a column.
I hope that helps som...
cocktail party algorithm SVD implementation … in one line of code?
...),1).*yy)*yy');
a = W*xx; %W is unmixing matrix
subplot(2,2,1); plot(x1); title('mixed audio - mic 1');
subplot(2,2,2); plot(x2); title('mixed audio - mic 2');
subplot(2,2,3); plot(a(1,:), 'g'); title('unmixed wave 1');
subplot(2,2,4); plot(a(2,:),'r'); title('unmixed wave 2');
audiowrite('unmixed...
Select first occurring element after another element
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Using the * matches any element as described in the title. Was a helpful reminder for me.
– James EJ
Aug 23 '13 at 12:17
1
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convert streamed buffers to utf8-string
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I changed the topic-title and edited the answer. It now shows both solutions: converting streamed buffers and a single buffer using toString.
– Biggie
Feb 16 '15 at 10:14
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Margin-Top not working for span element?
...make it inline-block or block
Change your CSS to be like this
span.first_title {
margin-top: 20px;
margin-left: 12px;
font-weight: bold;
font-size:24px;
color: #221461;
/*The change*/
display:inline-block; /*or display:block;*/
}
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How does a hash table work?
...em.
So, you decide that if the person that wants to read a book knows the title of the book and the exact title to boot, then that's all it should take. With the title, the person, with the aid of the librarian, should be able to find the book easily and quickly.
So, how can you do that? Well, obv...
CMake: Print out all accessible variables in a script
...ng about my variables that I defined, or the variables defined by included scripts.
4 Answers
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Log exception with traceback
...send STDERR to a file using whatever shell you're using to run your Python script. In a Bash script, you can do this with output redirection, as described in the BASH guide.
Examples
Append errors to file, other output to the terminal:
./test.py 2>> mylog.log
Overwrite file with interleav...
How to stop text from taking up more than 1 line?
...lipsis; white-space: nowrap; overflow: hidden">
This is a really long title, but it won't exceed the parent width
</h5>
(forgive the inline styles)
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