[Rails] Cannot access image_path in library class

[Martin Trummer]

Hi @ all,

In a rails application I have a nested module in my library:

    module Foo
      module Bar
        def foo_bar
          image_path("my_asset.png")
        end
      end
    end

Within `foo_bar` i can use `image_path`, a rails helper, without any
problems. It finds the asset int the asset-pipeline and constructs the
path.

When I now add a class inside this module, I cannot access `image_path`,
and therefore my asset, anymore like shown in the following example:

    module Foo
      module Bar
        class FooBar
          def foo_bar
            image_path("my_assset.png")
          end
        end
      end
    end

I get a `NoMethodError` as shown below.

    NoMethodError - undefined method `image_url' for
#<Foo::Bar::FooBar:0x007fe279d08280>:

Why can't I access `image_path` anymore, or what changes do I need to
get this working?

Thanks in advance,
Martin

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