ActiveSupport#presence method
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We want to set the default role to guest if both params[:role] is blank. By blank I mean either these values hold nil or '' .
Old way
def role(params: {})
params[:role].present? ? params[:role] : 'guest'
end
Using ActiveSupport#presence
def role(params: {})
params[:role].presence || 'guest'
end
It makes our code clean. ActiveSupport#presence returns an object if it’s #present? otherwise returns nil. object.presence is equivalent to object.present? ? object : nil
Another example:
def address(params: {})
params[:state].presence ||
params[:city].presence ||
params[:country].presence ||
'US'
end
Happy coding 🤘