Comment by Paweł Świątkowski on "Using Haml, I tried to solve the problem of "undefined method 'each' for nil:NilClass", but without success"

CommentUsing Haml, I tried to solve the problem of "undefined method 'each' for nil:NilClass", but without success

Paweł Świątkowski

Elixir developer with Ruby past

Jan 18, 2019

When you run haml from command line, it has no knowledge about your controller. set_input method was never called and therefore @images instance variable was never set (so it's nil). It looks like you are trying to use HAML in Rails context sou you should actually perform a request to you local server that will call the controller, which will set @images variable and then render HAML view.

Gustavo Benedito Costa

Deaf-born, computer science student and language lover

Jan 18, 2019

I changed set_input to images and nothing worked, but the HAML documentation is poor, I do not know how to call the controller from the Ruby to images in the HAML file.

I doubt it's doable like that. Instead you should probably try to run HAML programmatically from Ruby. For example:

template = File.read('input.haml')
haml_engine = Haml::Engine.new(template)
output = haml_engine.render(Object.new, images: Dir.glob('/home/gusbemacbe/icons/png/*.png'))
# print output to file here

Note that in this example you'll need to change from @images to just images in the template file (no instance variable). Or you could pass an object instead of Object.new where instance variable @images is present.

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