Assume you have a params array with the following items:
1 2 | params[ :qry ][ :name ] = 'jo' params[ :qry ][ :city ] = '' |
You would like to build a new URL with the current params appended. Should be as simple as:
1 | url_for( :action => 'list' , :params => params.merge( { :sort => key, :page => nil } ) ) |
Well that's not the case it results in the following URL:
http://localhost/controller/list?qry=namejocity&sort=created_at
Long live Rails! The frustrating part of it, is that it first converts inner Hashmaps to a string. I don't have a clue why!
The solution, put the following code in your ApplicationHelper. (Is a nice method to have ;-)
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 | # # Converts the given HASH array like 'params' to a flat # HASH array that's compatible with url_for and link_to # def flatten_param_hash( params ) found = true while found found = false new_hash = {} params. each do |key,value| if value.is_a?( Hash ) found = true value. each do |key2,value2| new_hash[ key.to_s + '[' + key2.to_s + ']' ] = value2 end else new_hash[ key.to_s ] = value end end params = new_hash end params end |
Adjust your code to the following
1 | url_for( :action => 'list' , :params => flatten_param_hash( params.merge( { :sort => key, :page => nil } ) ) ) |
And voila the result is now a little bit better:
http://localhost/controller/list?qry[name]=jo&qry[city]=&sort=created_at