forgeplus/app/controllers/api/v1/issues_controller.rb

class Api::V1::IssuesController < Api::V1::BaseController 

  before_action :require_public_and_member_above, only: [:index] 

  def index 
    @object_results = Api::V1::Issues::ListService.call(@project, query_params, current_user)
    @issues = kaminari_paginate(@object_results)
  end

  private 

  def query_params
    params.permit(
      :category,
      :participant_category, 
      :keyword, :author_id, 
      :milestone_id, :assigner_id,
      :status_id, 
      :sort_by, :sort_direction, 
      :issue_tag_ids => [])
  end

end