gistfile1.rb

class Api::Mobile::V1::GroupsController < Api::Mobile::V1::ApplicationApiController

  acts_as_token_authentication_handler_for User
  
  before_action :check_user_house_access
  before_action :check_group_id, only: [:accept, :leave, :join]
  before_action :check_user_group_access, only: [:accept, :leave]

  #Todo: invite friends to group

  def index
    public_groups = Group.where(house_id: params[:house_id], public: true).select(:id, :name, :icon, :feed_type)
    public_groups_ids = public_groups.map { |g| g.id }

    invited_groups_ids = UserGroupR.where(user_id: current_user.id, accepted: false).map { |r| r.group_id }
    invited_groups_ids = invited_groups_ids & public_groups_ids
    invited_groups = Group.where(id: invited_groups_ids).select(:id, :name, :icon, :feed_type)

    accepted_groups_ids = UserGroupR.where(user_id: current_user.id, accepted: true).map { |r| r.group_id }
    accepted_groups_ids = accepted_groups_ids & public_groups_ids
    accepted_groups = Group.where(id: accepted_groups_ids).select(:id, :name, :icon, :feed_type)

    return render json: {accepted: accepted_groups, invited: invited_groups, public: public_groups - accepted_groups - invited_groups}
  end

  def create
    return render status: 400, json: {error: "name_missing"} unless params[:name]
    return render status: 400, json: {error: "public_missing"} if params[:public].nil?

    group = Group.create(params.permit(:house_id, :name, :public, :description))
    return render json: group if UserGroupR.create(user_id: current_user.id, group_id: group.id, accepted: true)
  end

  def accept
    return render json: {message: "ok"} if @user_group_r.update(accepted: true)
  end

  def leave
    return render json: {message: "ok"} if @user_group_r.destroy
  end

  def join
    return render status: 400, json: {error: "user_already_join_this_group"} if UserGroupR.find_by(user_id: current_user.id, group_id: params[:id], accepted: true)
    return render json: {message: "ok"} if UserGroupR.create(user_id: current_user.id, group_id: params[:id], accepted: true)
  end

private
  def check_user_house_access
    return render status: 400, json: {error: "house_id_missing"} unless params[:house_id]
    if user_house_r = UserHouseR.find_by(user_id: current_user.id, house_id: params[:house_id])
      return render status: 403, json: {error: "membership_not_yet_confirmed"} unless user_house_r.is_member
    else
      return render status: 403, json: {error: "use_is_not_member_of_this_house"} 
    end
  end

  def check_group_id
    return render status: 400, json: {error: "id_missing"} unless params[:id]
  end

  def check_user_group_access
    @user_group_r = UserGroupR.find_by(user_id: current_user.id, group_id: params[:id])
    return render status: 400, json: {error: "user_group_r_not_found"} unless @user_group_r
  end
end