Add offer options for stall seeds with UI updates and tests

app/assets/stylesheets/_stalls.scss

@@ -484,3 +484,74 @@ $stall-label: #fff8e1;
   background: $white;
   cursor: pointer;
 }
+
+// "Free" and "swap" are words as well as colours, so neither relies on colour alone.
+.stall-offer-tag {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 0 0.5rem;
+  align-items: baseline;
+  margin-top: 0.6rem;
+  padding: 0.25rem 0.6rem;
+  border-radius: 2px;
+  color: $white;
+  line-height: 1.3;
+
+  strong {
+    font-weight: 800;
+    letter-spacing: 0.08em;
+    text-transform: uppercase;
+  }
+}
+
+.stall-offer-free {
+  background: $green;
+}
+
+.stall-offer-swap {
+  background: $blue;
+}
+
+.stall-legend {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 0.5rem;
+  align-items: center;
+  margin-bottom: 1.5rem;
+
+  .stall-offer-tag {
+    margin: 0;
+    font-size: 0.8rem;
+    font-weight: 800;
+    letter-spacing: 0.08em;
+    text-transform: uppercase;
+  }
+}
+
+.stall-offer {
+  margin: 1rem 0;
+  padding: 0;
+  border: 0;
+
+  legend {
+    font-size: 1rem;
+    font-weight: 600;
+  }
+}
+
+.stall-offer-choice {
+  display: inline-flex;
+  gap: 0.6rem;
+  align-items: center;
+  min-height: 44px;
+  margin-right: 0.75rem;
+  padding: 0 0.9rem;
+  border: 1px solid #757575;
+  border-radius: $card-radius;
+  background: $white;
+  cursor: pointer;
+
+  &:has(input:checked) {
+    border: 2px solid $green;
+  }
+}

app/controllers/stalls/seeds_controller.rb

@@ -23,7 +23,7 @@ module Stalls
       packets = current_member.seeds.where(id: params[:seed_ids])
       return redirect_to new_stall_seed_path, alert: t('.none') if packets.empty?
 
-      @stall.put_seeds_on!(packets)
+      @stall.put_seeds_on!(packets, offer: params[:offer].presence_in(StallSeed.offers.keys) || :free)
       redirect_to member_stall_path(current_member), notice: t('.added', count: packets.size)
     end
 

app/models/stall.rb

@@ -26,13 +26,13 @@ class Stall < ApplicationRecord
     update!(opened_at: nil)
   end
 
-  # Puts packets on the stall. A packet that isn't marked "will trade" is, so
+  # Puts packets on the stall, as free or as a swap. A packet that isn't marked "will trade" is, so
   # what friends see on the stall matches what they see in the seed library.
-  def put_seeds_on!(packets)
+  def put_seeds_on!(packets, offer: :free)
     transaction do
       packets.each do |seed|
         seed.update!(tradable_to: WILL_TRADE) unless seed.tradable
-        stall_seeds.find_or_create_by!(seed:)
+        stall_seeds.find_or_create_by!(seed:) { |stall_seed| stall_seed.offer = offer }
       end
     end
   end

app/models/stall_seed.rb

@@ -2,6 +2,9 @@
 
 # A packet of seed from the member's library, offered on their stall.
 class StallSeed < ApplicationRecord
+  # Given away, or swapped for seeds of the friend's own.
+  enum :offer, { free: 'free', swap: 'swap' }, default: :free
+
   belongs_to :stall
   belongs_to :seed
 

app/views/stalls/_seed_tin.html.haml

@@ -1,15 +1,24 @@
--# The packets on the stall, as seed packet cards on the table. The owner can add
--# more, or take one off.
+-# The packets on the stall, as seed packet cards on the table, each saying in
+-# words and colour whether it is free or a swap. The owner can add more, or take
+-# one off.
 %section.stall-section{ 'aria-labelledby': 'stall-tin-h' }
   .stall-section-header
     %h2#stall-tin-h= t('.heading')
     %span= t('.packets', count: stall.seeds.size)
     = link_to t('.add'), new_stall_seed_path, class: 'stall-add' if owner
   .stall-section-body
+    %p.stall-legend
+      %span.stall-offer-tag.stall-offer-free= t('stalls.offers.free')
+      %span.stall-offer-tag.stall-offer-swap= t('stalls.offers.swap')
+      = t('.legend')
     .stall-packets-grid
-      - stall.seeds.includes(:crop).find_each do |seed|
+      - stall.stall_seeds.includes(seed: :crop).find_each do |stall_seed|
+        - seed = stall_seed.seed
         .stall-tin-item
           = render 'seeds/card', seed: seed
+          .stall-offer-tag{ class: "stall-offer-#{stall_seed.offer}" }
+            %strong= t("stalls.offers.#{stall_seed.offer}")
+            %span= t("stalls.offers.#{stall_seed.offer}_text")
           - if owner
             = button_to stall_seed_path(seed), method: :delete, class: 'stall-take-off', title: t('.take_off') do
               = icon 'fas', 'xmark'

app/views/stalls/seeds/new.html.haml

@@ -27,6 +27,12 @@
     - if @others.any?
       %p.stall-note= t('.will_mark')
     %p= link_to t('.record_new'), new_seed_path
+    %fieldset.stall-offer
+      %legend= t('.offer')
+      - StallSeed.offers.each_key do |offer|
+        = label_tag "offer_#{offer}", class: 'stall-offer-choice' do
+          = radio_button_tag :offer, offer, offer == 'free'
+          = t(".offers.#{offer}")
     .d-flex.flex-wrap.gap-3
       = submit_tag t('.add'), class: 'btn btn-primary'
       = link_to t('.cancel'), member_stall_path(current_member), class: 'btn btn-secondary'

config/locales/en.yml

@@ -1195,6 +1195,11 @@ en:
     string: "%{crop} seeds belonging to %{owner}"
     updated: Seed was successfully updated.
   stalls:
+    offers:
+      free: Free
+      free_text: Yours for the asking
+      swap: Swap
+      swap_text: Bring seeds of your own
     openings:
       create:
         opened: Your garden stall is open.
@@ -1213,6 +1218,7 @@ en:
     seed_tin:
       add: "+ add"
       heading: In the seed tin
+      legend: Each packet says whether it's free or a swap.
       packets:
         one: 1 packet
         other: "%{count} packets"
@@ -1237,6 +1243,10 @@ en:
         breadcrumb: Add seeds
         cancel: Cancel
         intro: Pick seeds to put on the stall, from your seed library.
+        offer: What are you offering them as?
+        offers:
+          free: Give away
+          swap: Swap or trade
         no_matches: No seeds match "%{query}".
         none_left: Every packet you have is on the stall already.
         others:

db/migrate/20261101030000_add_offer_to_stall_seeds.rb

@@ -0,0 +1,7 @@
+# frozen_string_literal: true
+
+class AddOfferToStallSeeds < ActiveRecord::Migration[8.1]
+  def change
+    add_column :stall_seeds, :offer, :string, default: 'free', null: false
+  end
+end

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[8.1].define(version: 2026_11_01_020000) do
+ActiveRecord::Schema[8.1].define(version: 2026_11_01_030000) do
   # These are extensions that must be enabled in order to support this database
   enable_extension "pg_catalog.plpgsql"
   enable_extension "pg_trgm"
@@ -1119,6 +1119,7 @@ ActiveRecord::Schema[8.1].define(version: 2026_11_01_020000) do
 
   create_table "stall_seeds", force: :cascade do |t|
     t.datetime "created_at", null: false
+    t.string "offer", default: "free", null: false
     t.bigint "seed_id", null: false
     t.bigint "stall_id", null: false
     t.datetime "updated_at", null: false

spec/models/stall_spec.rb

@@ -47,8 +47,22 @@ describe Stall do
       expect(shared_seed.reload.tradable_to).to eq('nationally')
     end
 
+    it 'offers them free by default' do
+      expect(stall.stall_seeds.map(&:offer).uniq).to eq(['free'])
+    end
+
     it 'does not put a packet on twice' do
       expect { stall.put_seeds_on!([shared_seed]) }.not_to change(stall.stall_seeds, :count)
     end
   end
+
+  describe '#put_seeds_on! as a swap' do
+    subject(:stall) { create(:stall, :open) }
+
+    before { stall.put_seeds_on!([create(:seed, owner: stall.member)], offer: :swap) }
+
+    it 'offers them as a swap' do
+      expect(stall.stall_seeds.first).to be_swap
+    end
+  end
 end

spec/requests/stalls/seeds_controller_spec.rb

@@ -62,6 +62,22 @@ describe Stalls::SeedsController, flipper: :garden_stall do
       end
     end
 
+    context 'when offering them as a swap' do
+      before { post stall_seeds_path, params: { seed_ids: [shared.id], offer: 'swap' } }
+
+      it 'offers the packet as a swap' do
+        expect(stall.stall_seeds.first).to be_swap
+      end
+    end
+
+    context 'with an offer that is not one' do
+      before { post stall_seeds_path, params: { seed_ids: [shared.id], offer: 'sell' } }
+
+      it 'offers the packet free' do
+        expect(stall.stall_seeds.first).to be_free
+      end
+    end
+
     context 'with another member\'s packet' do
       before { post stall_seeds_path, params: { seed_ids: [create(:seed).id] } }
 

spec/requests/stalls_controller_spec.rb

@@ -62,6 +62,10 @@ describe StallsController, flipper: :garden_stall do
         expect(Capybara.string(response.body)).to have_css('.stall-section .seed-card', text: 'rocket')
       end
 
+      it 'says the packet is free' do
+        expect(Capybara.string(response.body)).to have_css('.stall-tin-item .stall-offer-free', text: 'Free')
+      end
+
       it 'lets the owner take a packet off' do
         expect(Capybara.string(response.body)).to have_button('Take off the stall')
       end