Refactor seed view path and improve not planted scope for better clarity

app/helpers/seed_filters_helper.rb

@@ -12,7 +12,6 @@ module SeedFiltersHelper
   # Pass `path` to look at someone else's seeds with the same filters.
   def seed_view_path(path: nil, **changes)
     kept = request.query_parameters.slice(*SEED_VIEW_PARAMS).merge(changes.stringify_keys).compact
-    kept.delete('page')
     path ||= request.path
     kept.empty? ? path : "#{path}?#{kept.to_query}"
   end
@@ -23,8 +22,8 @@ module SeedFiltersHelper
   end
 
   # The source chips: a label and the params it sets, where nil takes a param
-  # off. Each kind of filter has its own param, so they combine: bought and
-  # heirloom, near me and planted. Clicking a chosen chip takes it off again.
+  # off. Each kind of filter has its own param, so they combine: catalogue
+  # and heirloom, near me and planted. Clicking a chosen chip takes it off again.
   def seed_source_chips
     [['All', { from: nil }],
      ['My own saving', { from: 'own' }],

app/models/seed.rb

@@ -127,7 +127,7 @@ class Seed < ApplicationRecord
   scope :from_source, ->(kind) { where(source: SOURCES_BY_KIND.fetch(kind)) }
   scope :sown_in, ->(months) { where('seeds.sow_months && ARRAY[?]::integer[]', Array(months)) }
   scope :planted, -> { where(id: Planting.where.not(parent_seed_id: nil).select(:parent_seed_id)) }
-  scope :not_planted, -> { where.not(id: Planting.where.not(parent_seed_id: nil).select(:parent_seed_id)) }
+  scope :not_planted, -> { where.not(id: planted.select(:id)) }
 
   # Seeds of a crop and of its varieties: choosing tomato finds Brandywine
   # tomato seeds too.