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How to get the original value of an attribute in Rails
is there a way to get the original value that an ActiveRecord attribute (=the value that was loaded from the database)?
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How do I find the last occurrence of a substring in an NSString?
How would I get the last occurrence of an NSString within another NSString? For example, in "abc def ghi abc def ghi," I want to find the index of the second "abc," not the first. I know I could do this with a bunch of rangeOfStrings, but is there already a function for that?
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How do I combine two data frames?
I'm using Pandas data frames. I have a initial data frame, say D . I extract two data frames from it like this:
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Why is Cache-Control attribute sent in request header (client to server)?
After reading about the Cache-Control field of the HTTP header,
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How do I use the includes method in lodash to check if an object is in the collection?
lodash lets me check for membership of basic data types with includes :
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How can I modify the size of column in a MySQL table?
I have created a table and accidentally put varchar length as 300 instead of 65353 . How can I fix that?
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C++ equivalent of Java's toString?
I'd like to control what is written to a stream, i.e. cout , for an object of a custom class. Is that possible in C++? In Java you could override the toString() method for similar purpose.
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Distinct not working with LINQ to Objects
This is based on an example in "LINQ in Action". Listing 4.16.
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How to get the parents of a merge commit in git?
Some git commands take the parent as a revision; others (such as git revert ), as a parent number. How to get the parents for both cases. I don’t want to use the graphical log command as that often requires scrolling down a long tree to find the second parent.
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Are different ports on the same server considered cross-domain? (Ajax-wise)
Can XMLHttpRequest send a request to http:// mydomain.com:81/ from http:// mydomain.com/ ?
1 Answer
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