# How to pull text from database and eval it? **URL:** \ **Category:** Rails\ **Created:** [May 23, 2006, 4:47pm UTC](https://www.ruby-forum.com/t/how-to-pull-text-from-database-and-eval-it/61382 "2006-05-23T16:47:03Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![beachguy82](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/9dc877/32.png) [@beachguy82](https://www.ruby-forum.com/u/beachguy82)\ **Post date:** [May 23, 2006, 4:47pm UTC](https://www.ruby-forum.com/t/how-to-pull-text-from-database-and-eval-it/61382/1 "2006-05-23T16:47:03Z")
I’m trying to add some executable code to my blog posts. How can I include this inside of a blog post and eval it? Charlie bowman [http://www.recentrambles.com](http://www.recentrambles.com) ---
**Author:** ![beachguy82](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/9dc877/32.png) [@beachguy82](https://www.ruby-forum.com/u/beachguy82)\ **Post date:** [May 23, 2006, 4:53pm UTC](https://www.ruby-forum.com/t/how-to-pull-text-from-database-and-eval-it/61382/2 "2006-05-23T16:53:18Z")
On 5/23/06, Charlie B. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > I’m trying to add some executable code to my blog posts. How can I include this inside > of a blog post and eval it? In my controller I have a method that does this: @content = Content.find( :first, :conditions =\> [ ‘active = 1 AND action = ?’, params[:id] ] ) Then in my view I have this: \<%= render\_template ‘rhtml’, @content.body %\> ---
**Author:** ![beachguy82](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/9dc877/32.png) [@beachguy82](https://www.ruby-forum.com/u/beachguy82)\ **Post date:** [May 23, 2006, 4:56pm UTC](https://www.ruby-forum.com/t/how-to-pull-text-from-database-and-eval-it/61382/3 "2006-05-23T16:56:28Z")
I’m not sure I understand what you’re getting at. Currently I pull the post from the database, pass it to a template and the text is displayed. How could I embed a small block of code in that text that instead of being displayed, it will be executed? Forgive me if that’s what your already showing me. On Tue, 2006-05-23 at 09:51 -0500, Greg D. wrote: > \<%= render\_template ‘rhtml’, @content.body %\> Charlie B. [http://www.recentrambles.com](http://www.recentrambles.com) ---
**Author:** ![beachguy82](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/9dc877/32.png) [@beachguy82](https://www.ruby-forum.com/u/beachguy82)\ **Post date:** [May 23, 2006, 5:59pm UTC](https://www.ruby-forum.com/t/how-to-pull-text-from-database-and-eval-it/61382/4 "2006-05-23T17:59:19Z")
what if I"m only evaling part of the blog post. Would I need to store the executable code in a seperate field? I wouldn’t want to eval the entire post. On Tue, 2006-05-23 at 17:37 +0200, Simen wrote: > > > \<%= render\_template ‘rhtml’, @content.body %\> > > > It’s a Ruby method that evaluates a string. > > > Charlie B. > > > [http://www.recentrambles.com](http://www.recentrambles.com) ---
**Author:** ![beachguy82](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/9dc877/32.png) [@beachguy82](https://www.ruby-forum.com/u/beachguy82)\ **Post date:** [May 23, 2006, 5:37pm UTC](https://www.ruby-forum.com/t/how-to-pull-text-from-database-and-eval-it/61382/5 "2006-05-23T17:37:28Z")
Charlie B. wrote: > I’m not sure I understand what you’re getting at. Currently I pull the > post from the database, pass it to a template and the text is displayed. > How could I embed a small block of code in that text that instead of > being displayed, it will be executed? Forgive me if that’s what your > already showing me. > > On Tue, 2006-05-23 at 09:51 -0500, Greg D. wrote: > > > \<%= render\_template ‘rhtml’, @content.body %\> > > Charlie B. > [http://www.recentrambles.com](http://www.recentrambles.com) Use eval: \<%= eval(@your\_code\_block) %\> It’s a Ruby method that evaluates a string. ---
**Author:** ![beachguy82](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/9dc877/32.png) [@beachguy82](https://www.ruby-forum.com/u/beachguy82)\ **Post date:** [May 23, 2006, 6:13pm UTC](https://www.ruby-forum.com/t/how-to-pull-text-from-database-and-eval-it/61382/6 "2006-05-23T18:13:08Z")
On 5/23/06, Charlie B. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > I’m not sure I understand what you’re getting at. Currently I pull the post from > the database, pass it to a template and the text is displayed. How could I embed a > small block of code in that text that instead of being displayed, it will be executed? > Forgive me if that’s what your already showing me. render\_template will evaluate any embedded code you include. ---
**Author:** ![beachguy82](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/9dc877/32.png) [@beachguy82](https://www.ruby-forum.com/u/beachguy82)\ **Post date:** [May 23, 2006, 6:22pm UTC](https://www.ruby-forum.com/t/how-to-pull-text-from-database-and-eval-it/61382/7 "2006-05-23T18:22:43Z")
First put all the Ruby code that shall be executable into a tag: list = [1, 2, 3] list.each do |one| print one end So use a simple regex: @blog.content = @blog.content.gsub(/\(.\*?)\/) do |match| match = eval($1) end – Judofyr ---
**Author:** ![beachguy82](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/9dc877/32.png) [@beachguy82](https://www.ruby-forum.com/u/beachguy82)\ **Post date:** [May 23, 2006, 6:37pm UTC](https://www.ruby-forum.com/t/how-to-pull-text-from-database-and-eval-it/61382/8 "2006-05-23T18:37:35Z")
Thanks, that will work perfectly! So simple, it went right over my head! On Tue, 2006-05-23 at 18:22 +0200, Magnus H. wrote: > match = eval($1) > end > > – > > Judofyr Charlie B. [http://www.recentrambles.com](http://www.recentrambles.com)