Building Data-Driven Web Apps with Pyramid and SQLAlchemy Transcripts
Chapter: Using SQLAchemy
Lecture: Concept: Ordering data
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Databases are really good at filtering and ordering.
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Here's a function, find_all_packages
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and the idea is I would like really
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a list of all the packages in the database
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showing the newest ones first
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and the oldest ones last.
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So we're going to do a query on package
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and we don't do any filtering 'cause
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you know, we said in the name, we want them all
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but we are going to do an order by.
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So we say query a package.orderby
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and then we always express these operations
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in terms of the type, so package.created.
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And if we just said package, dot, created
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it would order ascending by the created date
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but we want descending, so we go to that descriptor created
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and we say, .desc, we call the function
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to reverse the sort and then we just say
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give us all the packages, here they come.
