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# Used in *_params methods to note an input parameter, yield to a block that then
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# filters the parameters and then set the parameter back in the filtered hash,
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# bypassing the filtering mechanism.
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#
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# This helps when passing hashes of data without a clear schema through filtering,
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# working around https://github.com/rails/rails/issues/9454.
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module Foreman::Controller::Parameters::KeepParam
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def keep_param(params, top_level_hash, *keys)
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# Delete keys being kept from the `params` hash, so the block yielded to filters the others
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old_params = keys.inject({}) do |op,(key,val)|
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if params[top_level_hash].has_key?(key)
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op[key] = params[top_level_hash].delete(key)
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op[key].permit! if op[key].is_a?(ActionController::Parameters)
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end
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op
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end
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filtered = yield
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old_params.each do |key,val|
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# Restore the deleted (kept) keys to the filtered hash of params from the block
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filtered[key] = val
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# Restore the deleted (kept) keys to the original params hash so it remains unchanged
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params[top_level_hash][key] = val
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end
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filtered
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end
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end
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