app/helpers/compare_helper.rb


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module CompareHelper
  def compare_to_mr_button?
    @project.merge_requests_enabled &&
      params[:from].present? &&
      params[:to].present? &&
      @repository.branch_names.include?(params[:from]) &&
      @repository.branch_names.include?(params[:to]) &&
      params[:from] != params[:to] &&
      !@refs_are_same
  end

  def compare_mr_path
    new_namespace_project_merge_request_path(
      @project.namespace,
      @project,
      merge_request: {
        source_branch: params[:to],
        target_branch: params[:from]
      }
    )
  end
end