Params.md

Params

HTTP/HTML Params

• Series of key-value pairs (e.g. key: 'value'). Both are strings
• Come from the user's browser when they request the page
• Encoded in the url

Example

For an HTTP GET request, if a user's browser requested

http://www.bs.com/?foo=1&boo=octopus

Then:

• params[:foo] would be "1"
• params[:boo] would be "octopus"

Rails & Params

Rails has a special syntax for making params into a hash with hashes inside

Example

if the user's browser requested

http://www.example.com/?vote[item_id]=1&vote[user_id]=2

Then:

• params[:vote] would be a hash
• params[:vote][:item_id] would be "1"
• params[:vote][:user_id] would be "2"