3986: Disallow duplicate items in audit

app/controllers/audits_controller.rb

@@ -51,7 +51,7 @@ def update
     if @audit.update(audit_params)
       save_audit_status_and_redirect(params)
     else
-      flash[:error] = "Something didn't work quite right -- try again?"
+      flash[:error] = @audit.errors.full_messages.join("\n")
       @storage_locations = [@audit.storage_location]
       set_items
       @audit.line_items.build if @audit.line_items.empty?
@@ -93,7 +93,8 @@ def destroy
 
   def handle_audit_errors
     error_message = @audit.errors.uniq(&:attribute).map do |error|
-      "#{error.attribute.capitalize} ".tr("_", " ") + error.message
+      attr = (error.attribute.to_s == 'base') ? '' : error.attribute.capitalize
+      "#{attr} ".tr("_", " ") + error.message
     end
     flash[:error] = error_message.join(", ")
   end

app/models/audit.rb

@@ -30,6 +30,7 @@ class Audit < ApplicationRecord
   validates :storage_location, :organization, presence: true
   validate :line_items_exist_in_inventory
   validate :line_items_quantity_is_not_negative
+  validate :line_items_unique_by_item_id
   validate :user_is_organization_admin_of_the_organization
 
   def self.storage_locations_audited_for(organization)
@@ -46,6 +47,16 @@ def user_is_organization_admin_of_the_organization
 
   private
 
+  def line_items_unique_by_item_id
+    item_ids = line_items.map(&:item_id)
+    duplicate_ids = item_ids.select { |i| item_ids.count(i) > 1 }
+    if duplicate_ids.any?
+      item_names = Item.where(id: duplicate_ids).map(&:name)
+      errors.add(:base,
+        "You have entered at least one duplicate item: #{item_names.join(", ")}")
+    end
+  end
+
   def line_items_quantity_is_not_negative
     line_items_quantity_is_at_least(0)
   end

spec/models/audit_spec.rb

@@ -64,6 +64,20 @@
       expect(audit.save).to be_falsey
     end
 
+    it 'cannot have duplicate line items' do
+      item = create(:item, name: "Dupe Item")
+      storage_location = create(:storage_location, :with_items, item: item, item_quantity: 10)
+      audit = build(:audit,
+                    storage_location: storage_location,
+                    line_items_attributes: [
+                      { item_id: item.id, quantity: 3 },
+                      { item_id: item.id, quantity: 5 }
+                    ])
+
+      expect(audit.save).to be_falsey
+      expect(audit.errors.full_messages).to eq(["You have entered at least one duplicate item: Dupe Item"])
+    end
+
     it "can have line items that has quantity as a positive integer" do
       item = create(:item)
       storage_location = create(:storage_location, :with_items, item: item, item_quantity: 10)