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| -rw-r--r-- | guides/source/active_record_querying.md | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/guides/source/active_record_querying.md b/guides/source/active_record_querying.md index c5eba38a78..f0e4ee83c5 100644 --- a/guides/source/active_record_querying.md +++ b/guides/source/active_record_querying.md @@ -1399,6 +1399,31 @@ You can specify an exclamation point (`!`) on the end of the dynamic finders to If you want to find both by name and locked, you can chain these finders together by simply typing "`and`" between the fields. For example, `Client.find_by_first_name_and_locked("Ryan", true)`. +Enums +----- + +Rails have a convenient keyword `enum`, used to map an integer column to a set +of possible values. + +```ruby +class Book < ActiveRecord::Base + enum availability: [:available, :unavailable] +end +``` + +Enums are a simple way to reduce boilerplate code, since it automatically +creates [scopes](#scopes) and adds some sintax sugar while querying. + +```ruby +# Both examples below query just available books. +Book.available +# or +Book.where(availability: :available) +``` + +Read the full documentation for enums +[in the Rails API](http://api.rubyonrails.org/classes/ActiveRecord/Enum.html). + Understanding The Method Chaining --------------------------------- |