Fixed issue #2 and likely #1

spec/sales_backend_spec.cr

@@ -6,6 +6,42 @@ describe SalesBackend do
     String.from_json(Global.response.not_nil!.body).should eq "OK"
   end
 
+  it "can compare addresses" do
+    address_str1 = Address.from_json %(
+        {
+        "name": "String",
+        "address1": "String",
+        "address2": "{type: String, nilable: true}",
+        "postcode": "00001",
+        "city": "String",
+        "country": 2
+        }
+    )
+    address_str2 = Address.from_json %(
+        {
+        "name": "String",
+        "address1": "String",
+        "address2": "{type: String, nilable: true}",
+        "postcode": "00002",
+        "city": "String",
+        "country": 2
+        }
+    )
+    address_str3 = Address.from_json %(
+        {
+        "name": "String",
+        "address1": "String",
+        "address2": "{type: String, nilable: true}",
+        "postcode": "00003",
+        "city": "String",
+        "country": 2
+        }
+    )
+    (address_str1<=>address_str1).should eq( 0)
+    (address_str3<=>address_str2).should eq(1)
+    (address_str1<=>address_str2).should eq(-1)
+  end
+
   it "can add a user able to log in and out" do
     Dir.mkdir_p Statics.data_path + "user"
     usr = User.new("dummy@domain.com")
@@ -46,7 +82,7 @@ describe SalesBackend do
     Global.response.not_nil!.status_code.should eq(200)
     address_state = Array(Address).from_json(Global.response.not_nil!.body)
     expected_address_state = Array(Address).from_json(new_address_str)
-    (address_state.to_json==expected_address_state.to_json).should be_true
+    (address_state.to_json == expected_address_state.to_json).should be_true
     get "/user/tokens", headers
     Global.response.not_nil!.status_code.should eq(200)
 

src/sales_backend/address.cr

@@ -20,6 +20,32 @@ class Address
         is_default: {type: Bool, default: false},
     )
     def <=> (other : Address)
-        self.to_json<=>other.to_json
+        cmp = @name<=>other.name
+        if cmp==0
+            cmp = @address1<=>other.address1
+            if cmp==0
+                if @address2.nil?
+                    if(other.address2.nil?)
+                        cmp=0
+                    elsif
+                        cmp=-1
+                    end
+                elsif other.address2.nil?
+                    cmp=1
+                else
+                    cmp = @address2.not_nil!<=>other.address2.not_nil!
+                end
+                if cmp==0
+                    cmp = @postcode<=>other.postcode
+                    if cmp==0
+                        cmp = @city<=>other.city
+                        if cmp==0
+                            cmp = @country<=>other.country
+                        end
+                    end
+                end
+            end
+        end
+        return cmp
     end
 end