Ruby on Rails .gsub regex and render partial

Question

I have a series of some strings, that i want to convert to render-partial.

For example. I have a @post.content, which contains

Lopem ipsum dolor sic amet *form_34e141443439d1000000* Lorem dolorem *form_f97391de6275724201000000*

Which i want to process.

I tried

content.gsub(/\*form_(.*?)\*/, render(partial: 'forms/render_form', object: CustomForm.where(_id: '\1').first, as: 'form_item'))

But that does not do anything correct, results only in "undefined local variable or method `form_item' for #<#:0xb53a2810>" error.

But if i try

content.gsub(/\*form_(.*?)\*/, render(partial: 'forms/render_form', object: '\1', as: 'form_item'))

and try <%= form_item %> in partial, it returns to me an correct value - f97391de6275724201000000

and if i try

content.gsub(/\*form_(.*?)\*/, render(partial: 'forms/render_form', object: CustomForm.where(_id: 'f97391de6275724201000000').first, as: 'form_item'))

it works just like i want it to - gets me a form model to process.

QUESTION:

How do i throw \\1 value from /*form_(.*?)*/ regexp to CustomForm.where(_id: '\\1').first ?

Answer 1

You can use the block form of the gsub method where the pattern match is available as the $1 variable:

content.gsub(/\*form_(.*?)\*/) do |match|
  render(partial: 'forms/render_form', 
         object: CustomForm.where(_id: $1).first, as: 'form_item'))
end