feat: Add nutritional data partial to crops and harvests

This commit introduces a new partial to display nutritional data from the Australian Food Composition Database.

Key changes:
- Adds a database index to the `public_food_key` on the `crops` table.
- Establishes a `has_one` relationship between `Crop` and `AustralianFoodClassificationData`.
- Creates a `_nutritional_data.html.haml` partial to display a summary of key nutritional information.
- Renders the partial on the `show` pages for both crops and harvests.

app/models/australian_food_classification_data.rb

@@ -1,2 +1,8 @@
+# frozen_string_literal: true
+
 class AustralianFoodClassificationData < ApplicationRecord
+  belongs_to :crop,
+             foreign_key: :public_food_key,
+             primary_key: :public_food_key,
+             inverse_of:  :australian_food_classification_data
 end

app/models/crop.rb

@@ -28,6 +28,10 @@ class Crop < ApplicationRecord
   has_many :companions, through: :crop_companions, source: :crop_b, class_name: 'Crop'
   has_many :crop_posts, dependent: :delete_all
   has_many :posts, through: :crop_posts, dependent: :delete_all
+  has_one :australian_food_classification_data,
+          foreign_key: :public_food_key,
+          primary_key: :public_food_key,
+          inverse_of:  :crop
 
   accepts_nested_attributes_for :scientific_names, allow_destroy: true, reject_if: :all_blank
 

app/views/crops/_nutritional_data.html.haml

@@ -0,0 +1,38 @@
+- data = crop.australian_food_classification_data
+- if data
+  .card
+    .card-body
+      %h4.card-title Nutritional Data
+      %p.card-text A summary of nutritional data per 100g.
+      %table.table.table-sm.table-borderless
+        %tbody
+          - if data.energy_with_dietary_fibre_equated_kj.to_f > 0
+            %tr
+              %th Energy
+              %td= "\#{data.energy_with_dietary_fibre_equated_kj.to_f.round(1)} kJ"
+          - if data.protein_g.to_f > 0
+            %tr
+              %th Protein
+              %td= "\#{data.protein_g.to_f.round(1)} g"
+          - if data.fat_total_g.to_f > 0
+            %tr
+              %th Fat, total
+              %td= "\#{data.fat_total_g.to_f.round(1)} g"
+          - if data.available_carbohydrate_with_sugar_alcohols_g.to_f > 0
+            %tr
+              %th Carbohydrate
+              %td= "\#{data.available_carbohydrate_with_sugar_alcohols_g.to_f.round(1)} g"
+          - if data.total_sugars_g.to_f > 0
+            %tr
+              %th - Sugars
+              %td= "\#{data.total_sugars_g.to_f.round(1)} g"
+          - if data.total_dietary_fibre_g.to_f > 0
+            %tr
+              %th Fibre
+              %td= "\#{data.total_dietary_fibre_g.to_f.round(1)} g"
+          - if data.sodium_na_mg.to_f > 0
+            %tr
+              %th Sodium
+              %td= "\#{data.sodium_na_mg.to_f.round(1)} mg"
+    .card-footer
+      = link_to "See more", "https://afcd.foodstandards.gov.au/fooddetails.aspx?PFKID=#{data.public_food_key}", target: "_blank", rel: "noopener noreferrer"

app/views/crops/show.html.haml

@@ -128,6 +128,8 @@
 
     = render 'openfarm_data', crop: @crop
 
+    = render 'nutritional_data', crop: @crop
+
     = cute_icon
     .card
       .card-body

app/views/harvests/show.html.haml

@@ -71,3 +71,4 @@
 
     .col-md-4.col-xs-12
       = render @harvest.crop
+      = render 'crops/nutritional_data', crop: @harvest.crop

db/migrate/20251201045000_add_index_to_crops_public_food_key.rb

@@ -0,0 +1,7 @@
+# frozen_string_literal: true
+
+class AddIndexToCropsPublicFoodKey < ActiveRecord::Migration[7.2]
+  def change
+    add_index :crops, :public_food_key
+  end
+end