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Jan 20 ’10

Find or Create an object in one command

The find_or_create_by_ dynamic finder will return the object if it already exists and otherwise creates it, then returns it:

# No 'Summer' tag exists
Tag.find_or_create_by_name("Summer") # equal to Tag.create(:name => "Summer")

# Now the 'Summer' tag does exist
Tag.find_or_create_by_name("Summer") # equal to Tag.find_by_name("Summer")

There’s also a find_or_initialize_by finder if you want to return a new record without saving it first:

# No 'Winter' tag exists
winter = Tag.find_or_initialize_by_name("Winter")
winter.new_record? # true

Everything taken from the Rails API.

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