created relationships controller for following/unfollowing users

app/assets/javascripts/relationships.coffee

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+# Place all the behaviors and hooks related to the matching controller here.
+# All this logic will automatically be available in application.js.
+# You can use CoffeeScript in this file: http://coffeescript.org/

app/assets/stylesheets/relationships.scss

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+// Place all the styles related to the Relationships controller here.
+// They will automatically be included in application.css.
+// You can use Sass (SCSS) here: http://sass-lang.com/

app/controllers/relationships_controller.rb

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+class RelationshipsController < ApplicationController
+  before_action :logged_in_user
+
+  def create
+    user = User.find(params[:followed_id])
+    current_user.follow(user)
+    redirect_to user
+  end
+
+  def destroy
+    user = Relationship.find(params[:id]).followed
+    current_user.unfollow(user)
+    redirect_to user
+  end
+end

app/helpers/relationships_helper.rb

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+module RelationshipsHelper
+end

test/controllers/relationships_controller_test.rb

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+require 'test_helper'
+
+class RelationshipsControllerTest < ActionController::TestCase
+
+  test "create should require logged-in user" do
+    assert_no_difference 'Relationship.count' do
+      post :create
+    end
+    assert_redirected_to login_url
+  end
+
+  test "destroy should require logged-in user" do
+    assert_no_difference 'Relationship.count' do
+      delete :destroy, id: relationships(:one)
+    end
+    assert_redirected_to login_url
+  end
+end