groups_controller.rb
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	class GroupsController < ApplicationController
	before_action :authenticate_user!

	before_action :group, only: [:show, :create_member, :destroy_member, :search_member]
	before_action :user, only: [:destroy_member]

	# GET /groups/1
	def show
	@domains = @group.domains
	end

	# POST /groups/1/members/
	def create_member
	@user = User.find_by_email(params[:email])
	if !@user
	redirect_to group_path(@group, anchor: 'tab-members'), alert: "User '#{params[:email]}' not found!"
	return
	end

	membership = @group.memberships.find_or_create_by!(user_id: @user.id)

	redirect_to group_path(@group, anchor: 'tab-members'), notice: "#{membership.user.email} is now a member of #{@group.name}"
	end

	# DELETE /groups/1/member/1
	def destroy_member
	membership = @group.memberships.find_by!(user_id: user.id)
	membership.destroy!

	redirect_to @group, notice: "#{membership.user.email} was successfully removed from #{@group.name}"
	end

	def search_member
	results = []

	if params[:q].present?
	uids = group.users.pluck(:id)
	results = User
	.where('email like ?', "#{params[:q]}%")
	.where.not(id: uids) # Exclude group members
	.limit(10)
	end

	render json: results.map { \|r\| Hash[:id, r.id, :email, r.email] }
	end

	private

	def user
	@user \|\|= User.find(params[:user_id])
	end

	end