how to embed variables in a link_to

rubyonrails-talk
1

Hello, I'm just trying to figure out how to put a variable into a link_to. I want to have the number of rows from my SQL statement in it. For example:

perfect matches (123)

where 123 is the number of rows. I currently have the number of rows in an array, but it just displays rows[pm_rows] (when I put rows['pm_rows'] it kicks a compile error due to the quotes) because its in quotations.... how can I escape this? My link_to looks like this:

<%= link_to 'perfect matches (rows[pm_rows])', :controller => 'compare', :action => 'perfectmatches' %>

Any help is appreciated!

Thank you! - Jeff Miller

2

Jeff Miller wrote:

Hello, I'm just trying to figure out how to put a variable into a link_to. I want to have the number of rows from my SQL statement in it. For example:

perfect matches (123)

where 123 is the number of rows. I currently have the number of rows in an array, but it just displays rows[pm_rows] (when I put rows['pm_rows'] it kicks a compile error due to the quotes) because its in quotations.... how can I escape this? My link_to looks like this:

<%= link_to 'perfect matches (rows[pm_rows])', :controller => 'compare', :action => 'perfectmatches' %>

Any help is appreciated!

Thank you! - Jeff Miller

Hi Jeff, You don't send the parameters as if it was a function call. Instead, you set some arbitrary hash key to the value in question in the URL part of the link_to, and then inside the link'ed to action you access it through the "params" with the key you gave it:

<%= link_to 'perfect matches',                :url => {:controller => 'compare',                                :action => 'perfectmatches',                                :my_rows => rows[pm_rows]} %>

def perfectmatches     my_rows = params[:my_rows] ... end

HTH, jp

3

"#{@myvar}"

Http://www.rubyplus.org Free Ruby & Rails screencasts

4

Hello, Thanks for your response! The thing is, I'm trying to get this variable into the link text, not trying to send it somewhere. My controller comes up with the number of rows and I want to put it in the link text so it would read something like "perfect matches (200)" where 200 would be rows['pm_rows']... The quotes just kill it each time though.... Any suggestions?

5

I got it to work, thanks!

<% for rows in @pm_rows %> <%= link_to "perfect matches (#{rows['pmrows']})", :controller => 'compare', :action => 'index' %> <% end %>