Add filtering for tradeable seeds (#4111)

* feat: Add filtering for tradeable seeds

This change introduces a new feature to filter seeds based on their tradeability.

- Adds a link on the homepage to view all tradeable seeds.
- Modifies the seeds controller to support filtering by `tradeable_to`, allowing multiple values to be selected.
- Adds links to the seeds index page to filter by the various `tradeable_to` values.

* Update index.html.haml

---------

Co-authored-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>
Co-authored-by: Daniel O'Connor <daniel.oconnor@gmail.com>

app/controllers/seeds_controller.rb

@@ -19,6 +19,10 @@ class SeedsController < DataController
       where['parent_planting'] = @planting.id
     end
 
+    if params[:tradeable_to].present?
+      where['tradeable_to'] = params[:tradeable_to]
+    end
+
     @show_all = (params[:all] == '1')
     where['finished'] = false unless @show_all
 

app/views/home/index.html.haml

@@ -51,7 +51,8 @@
     %section.seeds
       = cute_icon
       = render 'seeds'
-      %p.text-right= link_to "#{t('home.seeds.view_all')} »", seeds_path, class: 'btn btn-block'
+      %p.text-right
+        = link_to "#{t('home.seeds.view_all')} »", seeds_path(tradeable_to: ['locally', 'nationally', 'internationally']), class: 'btn btn-block'
   .col-12.col-lg-6
     %section.discussion.text-center
       = cute_icon

app/views/seeds/index.html.haml

@@ -17,6 +17,14 @@
       = check_box_tag 'active', 'all', @show_all
       include finished
     %hr/
+    %section.filters
+      %h2 Tradeable
+      %ul.nav.flex-column
+        %li.nav-item= link_to "All tradable seeds", seeds_path(tradeable_to: ['locally', 'nationally', 'internationally'])
+        - Seed::TRADABLE_TO_VALUES.each do |value|
+          - unless value == 'nowhere'
+            %li.nav-item= link_to value.capitalize, seeds_path(tradeable_to: value)
+    %hr/
     - if @owner
       = render @owner
     - if @crop