Fix sample product creation and use bang methods

Mistakes like the missing fee when creating product distributions were
hidden, because I didn't use the bang methods to create records.

lib/tasks/sample_data/addressing.rb

@@ -15,7 +15,7 @@ module Addressing
 
   def zone
     zone = Spree::Zone.find_or_create_by_name!("Australia")
-    zone.members.create(zonable: country)
+    zone.members.create!(zonable: country)
     zone
   end
 

lib/tasks/sample_data/inventory_factory.rb

@@ -18,7 +18,7 @@ class InventoryFactory
       enterprise: shop,
       variant: product.variants.first,
       visible: true
-    ).find_or_create_by_variant_id(product.variants.first.id)
+    ).find_or_create_by_variant_id!(product.variants.first.id)
     create_override(shop, product)
   end
 
@@ -29,6 +29,6 @@ class InventoryFactory
       price: 12,
       on_demand: false,
       count_on_hand: 5
-    ).find_or_create_by_variant_id(product.variants.first.id)
+    ).find_or_create_by_variant_id!(product.variants.first.id)
   end
 end

lib/tasks/sample_data/product_factory.rb

@@ -76,15 +76,18 @@ class ProductFactory
       unit_value: 1,
       on_demand: true
     )
-    create_product_with_distribution(params)
+    create_product_with_distribution(params, hash[:supplier])
   end
 
-  def create_product_with_distribution(params)
-    product = Spree::Product.create_with(params).find_or_create_by_name(params[:name])
-    ProductDistribution.create(
-      product: product,
-      distributor: params[:distributor]
-    )
+  def create_product_with_distribution(params, supplier)
+    product = Spree::Product.create_with(params).find_or_create_by_name!(params[:name])
+
+    distribution_params = {
+      distributor_id: params[:distributor].id,
+      enterprise_fee_id: supplier.enterprise_fees.first.id
+    }
+    ProductDistribution.create_with(distribution_params).find_or_create_by_product_id!(product.id)
+
     product
   end
 end