Okay, since I've got no response and since the traffic here is high enough
that this topic will be effectively "buried" soon, I'll follow up with my
final solution.
I decided what would be nice is a universal #link_to_self helper method. The
idea is that it otherwise works just like the existing #link_to family of
helpers (and in fact is coded based on their implementations). The
difference is that you simply don't provided the "where" aspect, since
you're linking to the same page. The improvement over simply using #link_tois,
as I described above, that the existing path will be re-used instead of
the default route in cases where multiple routes alias the same
controller/action pair.
My final implementation in my ApplicationHelper class (
app/helpers/application_helper.rb):
#
# This will create a link to the current document with the provided
options
# being added to the URL as query string parameters. You may either
provide
# the link text (the body) as the first parameter, or instead provide a
block
# that returns the content of the link. You may also provide a standard
# html_options hash.
#
# In addition to adding any provided options as parameters to the query
string
# this will also add all query string parameters from the current request
back
# into the query string as well. To override an existing query string
# parameter, simply provide an option of the same name (string or symbol
form)
# with the new value. If the new value is nil, the existing parameter will
be
# omitted. All non-string values will be converted using #to_s.
#
# Finally, you may provide an option with the key :fragment to specify a
# fragment identifier you'd like to be appended onto the end of the URL.
You
# _must_ use the symbol :fragment, not the string "fragment" for the key,
# otherwise the value will be added to the query string: "?fragment=value"
#
# == Signatures
#
# link_to_self(body, options = {}, html_options = {})
# # body is the "name" (contents) of the link
#
# link_to_self(options = {}, html_options = {}) do
# # link contents defined here
# end
#
def link_to_self(*args, &block)
if block_given?
options = args.first || {}
html_options = args.second
link_to_self(capture(&block), options, html_options)
else
name = args[0]
options = args[1] ? args[1].dup : {}
html_options = args[2]
fragment = options.delete(:fragment)
query_string =
options.with_indifferent_access.reverse_merge(request.query_parameters).map
{ |k, v|
v.nil? ? nil :
"#{Rack::Utils.escape(k.to_s)}=#{Rack::Utils.escape(v.to_s)}"
}.compact.join("&")
path = request.path
path += "?#{query_string}" unless query_string.blank?
path += "##{fragment}" unless fragment.blank?
result = link_to(name, path, html_options)
result
end
end
This is just for posterity and in case anyone else ever has a similar need.
I personally would love it if this functionality was in rails itself
(modification of #link_to, taking the :self symbol or simply acting this way
in the absence of a url string, a resource record, or a #url_for options
hash).
Seems to work great for what I need. Let me know anyone if rails already
does this somewhere (I doubt it now that I've done significant digging). I'd
also like recommendations on improvements that can be made within my
definition above for it to be more idiomatic (not rely on request.path,
request.query_parameters or use Rack::Utils.escape for example).
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