Persistent :: Yesod Web Framework Book- Version 1.6
selectList is the most commonly used, so we will cover it specifically. Understanding the others should be trivial after that. selectList takes two arguments: a list of Filters, and a list of SelectOpts. The former is what limits your results based on characteristics; it allows for equals, less than, is member of, and such. SelectOpts provides for three different features: sorting, limiting output
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