chains invoice and invoiceItem records. save them in archives

app/models/invoice.rb

@@ -212,14 +212,16 @@ class Invoice < ActiveRecord::Base
   end
 
   def chain_record
+    max_date = created_at || DateTime.now
+    previous = Invoice.where('created_at < ?', max_date)
+                      .order('created_at DESC')
+                      .limit(1)
+
+    columns  = Invoice.columns.map(&:name)
+                      .delete_if { |c| c == 'footprint' }
+
     sha256 = Digest::SHA256.new
-
-    previous = Invoice.where(created_at: Invoice.select('MAX(created_at)')).limit(1).first
-
-    self.footprint = sha256.hexdigest "#{id}#{invoice_id}#{invoiced_type}#{stp_invoice_id}#{total}#{created_at}#{updated_at}" \
-                                      "#{user_id}#{reference}#{avoir_mode}#{avoir_date}#{invoice_id}#{type}" \
-                                      "#{subscription_to_expire}#{description}#{wallet_amount}#{wallet_transaction_id}" \
-                                      "#{coupon_id}#{previous ? previous.footprint : ''}"
+    self.footprint = sha256.hexdigest "#{columns.map { |c| self[c] }.join}#{previous.first ? previous.first.footprint : ''}"
   end
 
   private

app/models/invoice_item.rb

@@ -3,4 +3,19 @@ class InvoiceItem < ActiveRecord::Base
   belongs_to :subscription
 
   has_one :invoice_item # to associated invoice_items of an invoice to invoice_items of an avoir
+
+  after_create :chain_record
+
+  def chain_record
+    max_date = created_at || Time.current
+    previous = InvoiceItem.where('created_at < ?', max_date)
+                          .order('created_at DESC')
+                          .limit(1)
+
+    columns = InvoiceItem.columns.map(&:name)
+                         .delete_if { |c| c == 'footprint' }
+
+    sha256 = Digest::SHA256.new
+    self.footprint = sha256.hexdigest "#{columns.map { |c| self[c] }.join}#{previous.first ? previous.first.footprint : ''}"
+  end
 end

app/views/archive/_accounting.json.jbuilder

@@ -1,6 +1,6 @@
 json.invoices do
   json.array!(invoices) do |invoice|
-    json.extract! invoice, :id, :stp_invoice_id, :created_at, :reference
+    json.extract! invoice, :id, :stp_invoice_id, :created_at, :reference, :footprint
     json.total number_to_currency(invoice.total / 100.0)
     json.invoiced do
       json.type invoice.invoiced_type
@@ -44,7 +44,7 @@ json.invoices do
       end
     end
     json.invoice_items invoice.invoice_items do |item|
-      json.extract! item, :id, :stp_invoice_item_id, :created_at, :description
+      json.extract! item, :id, :stp_invoice_item_id, :created_at, :description, :footprint
       json.amount number_to_currency(item.amount / 100.0)
     end
   end

db/schema.rb

@@ -11,12 +11,12 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20190110150532) do
+ActiveRecord::Schema.define(version: 20190211124726) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
-  enable_extension "unaccent"
   enable_extension "pg_trgm"
+  enable_extension "unaccent"
 
   create_table "abuses", force: :cascade do |t|
     t.integer  "signaled_id"
@@ -31,6 +31,15 @@ ActiveRecord::Schema.define(version: 20190110150532) do
 
   add_index "abuses", ["signaled_type", "signaled_id"], name: "index_abuses_on_signaled_type_and_signaled_id", using: :btree
 
+  create_table "accounting_periods", force: :cascade do |t|
+    t.date     "start_at"
+    t.date     "end_at"
+    t.datetime "closed_at"
+    t.integer  "closed_by"
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+  end
+
   create_table "addresses", force: :cascade do |t|
     t.string   "address"
     t.string   "street_number"
@@ -241,6 +250,7 @@ ActiveRecord::Schema.define(version: 20190110150532) do
     t.text     "description"
     t.integer  "subscription_id"
     t.integer  "invoice_item_id"
+    t.string   "footprint"
   end
 
   add_index "invoice_items", ["invoice_id"], name: "index_invoice_items_on_invoice_id", using: :btree
@@ -263,6 +273,7 @@ ActiveRecord::Schema.define(version: 20190110150532) do
     t.integer  "wallet_amount"
     t.integer  "wallet_transaction_id"
     t.integer  "coupon_id"
+    t.string   "footprint"
   end
 
   add_index "invoices", ["coupon_id"], name: "index_invoices_on_coupon_id", using: :btree
@@ -855,6 +866,7 @@ ActiveRecord::Schema.define(version: 20190110150532) do
 
   add_index "wallets", ["user_id"], name: "index_wallets_on_user_id", using: :btree
 
+  add_foreign_key "accounting_periods", "users", column: "closed_by"
   add_foreign_key "availability_tags", "availabilities"
   add_foreign_key "availability_tags", "tags"
   add_foreign_key "event_price_categories", "events"

lib/tasks/fablab/setup.rake

@@ -0,0 +1,21 @@
+# frozen_string_literal: true
+
+namespace :fablab do
+  namespace :setup do
+    desc 'assign all footprints to existing Invoice records'
+    task chain_invoices_records: :environment do
+      Invoice.order(:created_at).all.each do |i|
+        i.chain_record
+        i.save!
+      end
+    end
+
+    desc 'assign all footprints to existing InvoiceItem records'
+    task chain_invoices_items_records: :environment do
+      InvoiceItem.order(:created_at).all.each do |i|
+        i.chain_record
+        i.save!
+      end
+    end
+  end
+end