ruby - How does lambda function works in rails with an example from paperclip gem -

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i had problem paperclip gem default_url doesn't load after fingerprinted in production environment, code this:

class user  # attachments paperclip - profile pic   has_attached_file :profilepic_attachment,                      :styles => {                        thumb: '100x100#',                       square: '500x500#'                     },                     :default_url => actioncontroller::base.helpers.asset_path("missing/default_user.png"),                     :preserve_files => true   validates_attachment_content_type :profilepic_attachment, content_type: /\aimage\/.*\z/  end

note when rails c in production , print out actioncontroller::base.helpers.asset_path("missing/default_user.png"). fingerprinted version (correct version) printed out. default_user-fb34158daae99f297ad672c43bb1a4d3917d8e272b5f2254aa055392aa2faa94.png.

however, when inspect browser, original /assets/missing/default_user.png appeared.

i struggled long time until came across post, tells me change

:default_url => actioncontroller::base.helpers.asset_path("missing/default_user.png"),

to

:default_url => lambda { |image| actioncontroller::base.helpers.asset_path("missing/default_user.png") },

i wasn't sure happened, works. wonder lambda function , when used in rails? also, passed in variable |image| seems wasn't use in code. why that?

thanks!


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