如何在轨道上使用Rspec Capybara和Factory Girl在Ruby中计算循环

这个问题是关于测试我进行的，以验证用户页面中的所有50个微柱都显示

我有这个rsspec代码：

          before(:all) { 50.times {FactoryGirl.create(:micropost, 
                                   user:user, content: "Lorem Ipsum") } }

我想让每个内容都更加动态，比如：

"Lorem Ispum 0"
"Lorem Ipsum 1"
"Lorem Ipsum 2"
...

我试着写：

let(:count_helper) { 0 }
before(:all) { 50.times {FactoryGirl.create(:micropost, 
                                       user:user, 
                                       content: "Lorem Ipsum #{count_helper}") 
                         count_helper += 1} }

它在这里失败了：

count_helper += 1 

我怎样才能把它写对？

let(:count_helper) { 0 }
before(:all) { 50.times {FactoryGirl.create(:micropost, 
                                       user:user, 
                                       content: "Lorem Ipsum #{count_helper}");
                                       count_helper += 1 } }

    before(:all) { 50.times do |count|
                     FactoryGirl.create(:micropost, user:user, 
                     content: "Lorem Ipsum #{count}") 
                   end }