Add searchable dropdowns for producers, categories, and tax categories in products_v3

app/controllers/admin/products_v3_controller.rb

@@ -4,6 +4,7 @@
 module Admin
   class ProductsV3Controller < Spree::Admin::BaseController
     helper ProductsHelper
+    include ::Products::AjaxSearch
 
     before_action :init_filters_params
     before_action :init_pagination_params

app/controllers/concerns/products/ajax_search.rb

@@ -0,0 +1,58 @@
+# frozen_string_literal: true
+
+module Products
+  module AjaxSearch
+    extend ActiveSupport::Concern
+
+    def search_producers
+      query = OpenFoodNetwork::Permissions.new(spree_current_user)
+        .managed_product_enterprises.is_primary_producer.by_name
+
+      render json: build_search_response(query)
+    end
+
+    def search_categories
+      query = Spree::Taxon.all
+
+      render json: build_search_response(query)
+    end
+
+    def search_tax_categories
+      query = Spree::TaxCategory.all
+
+      render json: build_search_response(query)
+    end
+
+    private
+
+    def build_search_response(query)
+      page = (params[:page] || 1).to_i
+      per_page = 30
+
+      filtered_query = apply_search_filter(query)
+      total_count = filtered_query.size
+      items = paginated_items(filtered_query, page, per_page)
+      results = format_results(items)
+
+      { results: results, pagination: { more: (page * per_page) < total_count } }
+    end
+
+    def apply_search_filter(query)
+      search_term = params[:q]
+      return query if search_term.blank?
+
+      escaped_search_term = ActiveRecord::Base.sanitize_sql_like(search_term)
+      pattern = "%#{escaped_search_term}%"
+
+      query.where('name ILIKE ?', pattern)
+    end
+
+    def paginated_items(query, page, per_page)
+      query.order(:name).offset((page - 1) * per_page).limit(per_page).pluck(:name, :id)
+    end
+
+    def format_results(items)
+      items.map { |label, value| { value:, label: } }
+    end
+  end
+end