How to render erb template to string inside action?

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囚心锁ツ

I need a string of html (something like \"Hello World\") for faxing purpose.

I wrote it into a seprat

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一整个雨季

2020-12-16 15:22

Use the #render_to_string method

it works the same way as the typical render method but useful when you need to add some templated HTML to a json response

http://apidock.com/rails/ActionController/Base/render_to_string

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囚心锁ツ

2020-12-16 15:34

If you don't want to escape html, just call .html_safe on it:

"<html><body>Hello World</body></html>".html_safe

Re your error, please post your OrdersController - looks like you are calling render or redirect more than once in the create action.

(Btw, just in case you are trying it - you can't render a partial in a controller - you can only render partials in views)

Edit: yeah your problem is you trying to render a partial in the controller action. You could use an after_create callback to set up and send the fax - though again you won't want to use a partial (as they are for views). http://api.rubyonrails.org/classes/ActiveRecord/Callbacks.html

Edit: for your fax problem,you could create a normal Ruby Class, see this excellent bit of advice from Yehuda: https://stackoverflow.com/a/1071510/468009

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野的像风

2020-12-16 15:41
If you only need the rendered HTML, and don't need any functionality from the controller, you might try using ERB directly within a helper class, eg.:
```
module FaxHelper

  def to_fax
    html = File.open(path_to_template).read
    template = ERB.new(html)
    template.result
  end

end
```
The ERB docs explain this in more detail.

EDIT

To get the instance variables from the controller, pass the binding into the result call, eg:
```
# controller
to_fax(binding)

# helper class
def to_fax(controller_binding)
  html = File.open(path_to_template).read
  template = ERB.new(html)
  template.result(controller_binding)
end
```
Note: I've never done this, but it seems workable :)
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猫巷女王i

2020-12-16 15:43
The reason is you cannot render or redirect inside the same action more than once at a given time.

But in your code, you have both render and redirect. I think in your controller you can use simply only the render, assuming you don't need any json output.

Try this
```
def create
  @order.save   
  render(:partial => 'fax')
end
```
I haven't tested this, but I guess you get the idea :), and think about a way to handle errors as well (in case order didn't save).
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