Shipping Invoice Example Code

1trigger calculate on Item__c (after insert, after update, after delete) {
2
3// Use a map because it doesn't allow duplicate values
4
5Map<ID, Shipping_Invoice__C> updateMap = new Map<ID, Shipping_Invoice__C>();
6
7// Set this integer to -1 if we are deleting
8Integer subtract ;
9
10// Populate the list of items based on trigger type
11List<Item__c> itemList;
12    if(trigger.isInsert || trigger.isUpdate){
13        itemList = Trigger.new;
14        subtract = 1;
15    }
16    else if(trigger.isDelete)
17    {
18        // Note -- there is no trigger.new in delete
19        itemList = trigger.old;
20        subtract = -1;
21    }
22
23// Access all the information we need in a single query 
24// rather than querying when we need it.
25// This is a best practice for bulkifying requests
26
27set<Id> AllItems = new set<id>();
28
29for(item__c i :itemList){
30// Assert numbers are not negative.  
31// None of the fields would make sense with a negative value
32
33System.assert(i.quantity__c > 0, 'Quantity must be positive');
34System.assert(i.weight__c >= 0, 'Weight must be non-negative');
35System.assert(i.price__c >= 0, 'Price must be non-negative');
36
37// If there is a duplicate Id, it won't get added to a set
38AllItems.add(i.Shipping_Invoice__C);
39}
40
41// Accessing all shipping invoices associated with the items in the trigger
42List<Shipping_Invoice__C> AllShippingInvoices = [SELECT Id, ShippingDiscount__c, 
43                   SubTotal__c, TotalWeight__c, Tax__c, GrandTotal__c 
44                   FROM Shipping_Invoice__C WHERE Id IN :AllItems];
45                   
46// Take the list we just populated and put it into a Map.  
47// This will make it easier to look up a shipping invoice
48// because you must iterate a list, but you can use lookup for a map, 
49Map<ID, Shipping_Invoice__C> SIMap = new Map<ID, Shipping_Invoice__C>();
50
51for(Shipping_Invoice__C sc : AllShippingInvoices)
52{
53    SIMap.put(sc.id, sc);
54}
55
56// Process the list of items
57    if(Trigger.isUpdate)
58    {
59        // Treat updates like a removal of the old item and addition of the         
60        // revised item rather than figuring out the differences of each field 
61        // and acting accordingly.
62        // Note updates have both trigger.new and trigger.old
63        for(Integer x = 0; x < Trigger.old.size(); x++)
64        {
65            Shipping_Invoice__C myOrder;
66            myOrder = SIMap.get(trigger.old[x].Shipping_Invoice__C);
67
68            // Decrement the previous value from the subtotal and weight.
69            myOrder.SubTotal__c -= (trigger.old[x].price__c * 
70                                    trigger.old[x].quantity__c);
71            myOrder.TotalWeight__c -= (trigger.old[x].weight__c * 
72                                       trigger.old[x].quantity__c);
73                
74            // Increment the new subtotal and weight.
75            myOrder.SubTotal__c += (trigger.new[x].price__c * 
76                                    trigger.new[x].quantity__c);
77            myOrder.TotalWeight__c += (trigger.new[x].weight__c * 
78                                       trigger.new[x].quantity__c);
79        }
80        
81        for(Shipping_Invoice__C myOrder : AllShippingInvoices)
82        {
83            
84            // Set tax rate to 9.25%  Please note, this is a simple example.  
85            // Generally, you would never hard code values.
86            // Leveraging Custom Settings for tax rates is a best practice.  
87            // See Custom Settings in the Apex Developer Guide 
88            // for more information.
89            myOrder.Tax__c = myOrder.Subtotal__c * .0925;
90            
91            // Reset the shipping discount
92            myOrder.ShippingDiscount__c = 0;
93    
94            // Set shipping rate to 75 cents per pound.  
95            // Generally, you would never hard code values.
96            // Leveraging Custom Settings for the shipping rate is a best practice.
97            // See Custom Settings in the Apex Developer Guide 
98            // for more information.
99            myOrder.Shipping__c = (myOrder.totalWeight__c * .75);
100            myOrder.GrandTotal__c = myOrder.SubTotal__c + myOrder.tax__c + 
101                                    myOrder.Shipping__c;
102            updateMap.put(myOrder.id, myOrder);
103         }
104    }
105    else
106    { 
107        for(Item__c itemToProcess : itemList)
108        {
109            Shipping_Invoice__C myOrder;
110    
111            // Look up the correct shipping invoice from the ones we got earlier
112            myOrder = SIMap.get(itemToProcess.Shipping_Invoice__C);
113            myOrder.SubTotal__c += (itemToProcess.price__c * 
114                                    itemToProcess.quantity__c * subtract);
115            myOrder.TotalWeight__c += (itemToProcess.weight__c * 
116                                       itemToProcess.quantity__c * subtract);
117        }
118        
119        for(Shipping_Invoice__C myOrder : AllShippingInvoices)
120        {
121            
122             // Set tax rate to 9.25%  Please note, this is a simple example.  
123             // Generally, you would never hard code values.
124             // Leveraging Custom Settings for tax rates is a best practice.  
125             // See Custom Settings in the Apex Developer Guide 
126             // for more information.
127             myOrder.Tax__c = myOrder.Subtotal__c * .0925;
128             
129             // Reset shipping discount
130             myOrder.ShippingDiscount__c = 0;
131    
132            // Set shipping rate to 75 cents per pound.  
133            // Generally, you would never hard code values.
134            // Leveraging Custom Settings for the shipping rate is a best practice.
135            // See Custom Settings in the Apex Developer Guide 
136            // for more information.
137            myOrder.Shipping__c = (myOrder.totalWeight__c * .75);
138            myOrder.GrandTotal__c = myOrder.SubTotal__c + myOrder.tax__c + 
139                                    myOrder.Shipping__c;
140                                       
141            updateMap.put(myOrder.id, myOrder);
142    
143         }
144     }    
145     
146     // Only use one DML update at the end.
147     // This minimizes the number of DML requests generated from this trigger.
148     update updateMap.values();
149}

1trigger ShippingDiscount on Shipping_Invoice__C (before update) {
2    // Free shipping on all orders greater than $100
3    
4    for(Shipping_Invoice__C myShippingInvoice : Trigger.new)
5    {
6        if((myShippingInvoice.subtotal__c >= 100.00) && 
7           (myShippingInvoice.ShippingDiscount__c == 0))
8        {
9            myShippingInvoice.ShippingDiscount__c = 
10                         myShippingInvoice.Shipping__c * -1;
11            myShippingInvoice.GrandTotal__c += myShippingInvoice.ShippingDiscount__c;
12        }
13    }
14}

1@IsTest
2private class TestShippingInvoice{
3
4    // Test for inserting three items at once
5    public static testmethod void testBulkItemInsert(){
6        // Create the shipping invoice. It's a best practice to either use defaults
7        // or to explicitly set all values to zero so as to avoid having
8        // extraneous data in your test.
9        Shipping_Invoice__C order1 = new Shipping_Invoice__C(subtotal__c = 0, 
10                          totalweight__c = 0, grandtotal__c = 0, 
11                          ShippingDiscount__c = 0, Shipping__c = 0, tax__c = 0);
12
13        // Insert the order and populate with items
14        insert Order1;
15        List<Item__c> list1 = new List<Item__c>();
16        Item__c item1 = new Item__C(Price__c = 10, weight__c = 1, quantity__c = 1, 
17                                    Shipping_Invoice__C = order1.id);
18        Item__c item2 = new Item__C(Price__c = 25, weight__c = 2, quantity__c = 1, 
19                                    Shipping_Invoice__C = order1.id);
20        Item__c item3 = new Item__C(Price__c = 40, weight__c = 3, quantity__c = 1, 
21                                    Shipping_Invoice__C = order1.id);
22        list1.add(item1);
23        list1.add(item2);
24        list1.add(item3);
25        insert list1;
26        
27        // Retrieve the order, then do assertions
28        order1 = [SELECT id, subtotal__c, tax__c, shipping__c, totalweight__c, 
29                  grandtotal__c, shippingdiscount__c 
30                  FROM Shipping_Invoice__C 
31                  WHERE id = :order1.id];
32        
33        System.assert(order1.subtotal__c == 75, 
34                'Order subtotal was not $75, but was '+ order1.subtotal__c);
35        System.assert(order1.tax__c == 6.9375, 
36                'Order tax was not $6.9375, but was ' + order1.tax__c);
37        System.assert(order1.shipping__c == 4.50, 
38                'Order shipping was not $4.50, but was ' + order1.shipping__c);
39        System.assert(order1.totalweight__c == 6.00, 
40                'Order weight was not 6 but was ' + order1.totalweight__c);
41        System.assert(order1.grandtotal__c == 86.4375, 
42                'Order grand total was not $86.4375 but was ' 
43                 + order1.grandtotal__c);
44        System.assert(order1.shippingdiscount__c == 0, 
45                'Order shipping discount was not $0 but was ' 
46                + order1.shippingdiscount__c);
47    }
48    
49    // Test for updating three items at once
50    public static testmethod void testBulkItemUpdate(){
51
52        // Create the shipping invoice. It's a best practice to either use defaults
53        // or to explicitly set all values to zero so as to avoid having
54        // extraneous data in your test.
55        Shipping_Invoice__C order1 = new Shipping_Invoice__C(subtotal__c = 0, 
56                          totalweight__c = 0, grandtotal__c = 0, 
57                          ShippingDiscount__c = 0, Shipping__c = 0, tax__c = 0);
58
59        // Insert the order and populate with items.
60        insert Order1;
61        List<Item__c> list1 = new List<Item__c>();
62        Item__c item1 = new Item__C(Price__c = 1, weight__c = 1, quantity__c = 1, 
63                                    Shipping_Invoice__C = order1.id);
64        Item__c item2 = new Item__C(Price__c = 2, weight__c = 2, quantity__c = 1, 
65                                    Shipping_Invoice__C = order1.id);
66        Item__c item3 = new Item__C(Price__c = 4, weight__c = 3, quantity__c = 1, 
67                                    Shipping_Invoice__C = order1.id);
68        list1.add(item1);
69        list1.add(item2);
70        list1.add(item3);
71        insert as system list1;
72        
73        // Update the prices on the 3 items
74        list1[0].price__c = 10;
75        list1[1].price__c = 25;
76        list1[2].price__c = 40;
77        update as system list1;
78        
79        // Access the order and assert items updated
80        order1 = [SELECT id, subtotal__c, tax__c, shipping__c, totalweight__c, 
81                  grandtotal__c, shippingdiscount__c 
82                  FROM Shipping_Invoice__C 
83                  WHERE Id = :order1.Id];
84
85        System.assert(order1.subtotal__c == 75, 
86                       'Order subtotal was not $75, but was '+ order1.subtotal__c);
87        System.assert(order1.tax__c == 6.9375, 
88                       'Order tax was not $6.9375, but was ' + order1.tax__c);
89        System.assert(order1.shipping__c == 4.50, 
90                       'Order shipping was not $4.50, but was ' 
91                       + order1.shipping__c);
92        System.assert(order1.totalweight__c == 6.00, 
93                       'Order weight was not 6 but was ' + order1.totalweight__c);
94        System.assert(order1.grandtotal__c == 86.4375, 
95                       'Order grand total was not $86.4375 but was ' 
96                       + order1.grandtotal__c);
97        System.assert(order1.shippingdiscount__c == 0, 
98                       'Order shipping discount was not $0 but was ' 
99                       + order1.shippingdiscount__c);
100    
101    }
102    
103    // Test for deleting items
104    public static testmethod void testBulkItemDelete(){
105
106        // Create the shipping invoice. It's a best practice to either use defaults
107        // or to explicitly set all values to zero so as to avoid having
108        // extraneous data in your test.
109        Shipping_Invoice__C order1 = new Shipping_Invoice__C(subtotal__c = 0, 
110                          totalweight__c = 0, grandtotal__c = 0, 
111                          ShippingDiscount__c = 0, Shipping__c = 0, tax__c = 0);
112
113        // Insert the order and populate with items
114        insert Order1;
115        List<Item__c> list1 = new List<Item__c>();
116        Item__c item1 = new Item__C(Price__c = 10, weight__c = 1, quantity__c = 1, 
117                                    Shipping_Invoice__C = order1.id);
118        Item__c item2 = new Item__C(Price__c = 25, weight__c = 2, quantity__c = 1, 
119                                    Shipping_Invoice__C = order1.id);
120        Item__c item3 = new Item__C(Price__c = 40, weight__c = 3, quantity__c = 1, 
121                                    Shipping_Invoice__C = order1.id);
122        Item__c itemA = new Item__C(Price__c = 1, weight__c = 3, quantity__c = 1, 
123                                    Shipping_Invoice__C = order1.id);
124        Item__c itemB = new Item__C(Price__c = 1, weight__c = 3, quantity__c = 1, 
125                                    Shipping_Invoice__C = order1.id);
126        Item__c itemC = new Item__C(Price__c = 1, weight__c = 3, quantity__c = 1, 
127                                    Shipping_Invoice__C = order1.id);
128        Item__c itemD = new Item__C(Price__c = 1, weight__c = 3, quantity__c = 1, 
129                                    Shipping_Invoice__C = order1.id);
130        list1.add(item1);
131        list1.add(item2);
132        list1.add(item3);
133        list1.add(itemA);
134        list1.add(itemB);
135        list1.add(itemC);
136        list1.add(itemD);
137        insert list1;
138        
139        // Seven items are now in the shipping invoice. 
140       // The following deletes four of them.
141        List<Item__c> list2 = new List<Item__c>();
142        list2.add(itemA);
143        list2.add(itemB);
144        list2.add(itemC);
145        list2.add(itemD);
146        delete list2;
147        
148        // Retrieve the order and verify the deletion
149        order1 = [SELECT id, subtotal__c, tax__c, shipping__c, totalweight__c, 
150                  grandtotal__c, shippingdiscount__c 
151                  FROM Shipping_Invoice__C 
152                  WHERE Id = :order1.Id];
153        
154        System.assert(order1.subtotal__c == 75, 
155                      'Order subtotal was not $75, but was '+ order1.subtotal__c);
156        System.assert(order1.tax__c == 6.9375, 
157                      'Order tax was not $6.9375, but was ' + order1.tax__c);
158        System.assert(order1.shipping__c == 4.50, 
159                      'Order shipping was not $4.50, but was ' + order1.shipping__c);
160        System.assert(order1.totalweight__c == 6.00, 
161                      'Order weight was not 6 but was ' + order1.totalweight__c);
162        System.assert(order1.grandtotal__c == 86.4375, 
163                      'Order grand total was not $86.4375 but was ' 
164                      + order1.grandtotal__c);
165        System.assert(order1.shippingdiscount__c == 0, 
166                      'Order shipping discount was not $0 but was ' 
167                      + order1.shippingdiscount__c);
168    }
169    // Testing free shipping
170    public static testmethod void testFreeShipping(){
171
172        // Create the shipping invoice. It's a best practice to either use defaults
173        // or to explicitly set all values to zero so as to avoid having
174        // extraneous data in your test.
175        Shipping_Invoice__C order1 = new Shipping_Invoice__C(subtotal__c = 0, 
176                          totalweight__c = 0, grandtotal__c = 0, 
177                          ShippingDiscount__c = 0, Shipping__c = 0, tax__c = 0);
178
179        // Insert the order and populate with items.
180        insert Order1;
181        List<Item__c> list1 = new List<Item__c>();
182        Item__c item1 = new Item__C(Price__c = 10, weight__c = 1, 
183                                 quantity__c = 1, Shipping_Invoice__C = order1.id);
184        Item__c item2 = new Item__C(Price__c = 25, weight__c = 2, 
185                                 quantity__c = 1, Shipping_Invoice__C = order1.id);
186        Item__c item3 = new Item__C(Price__c = 40, weight__c = 3, 
187                                 quantity__c = 1, Shipping_Invoice__C = order1.id);
188        list1.add(item1);
189        list1.add(item2);
190        list1.add(item3);
191        insert list1;
192        
193        // Retrieve the order and verify free shipping not applicable
194        order1 = [SELECT id, subtotal__c, tax__c, shipping__c, totalweight__c, 
195                  grandtotal__c, shippingdiscount__c 
196                  FROM Shipping_Invoice__C 
197                  WHERE Id = :order1.Id];
198        
199        // Free shipping not available on $75 orders
200        System.assert(order1.subtotal__c == 75, 
201                      'Order subtotal was not $75, but was '+ order1.subtotal__c);
202        System.assert(order1.tax__c == 6.9375, 
203                      'Order tax was not $6.9375, but was ' + order1.tax__c);
204        System.assert(order1.shipping__c == 4.50, 
205                      'Order shipping was not $4.50, but was ' + order1.shipping__c);
206        System.assert(order1.totalweight__c == 6.00, 
207                      'Order weight was not 6 but was ' + order1.totalweight__c);
208        System.assert(order1.grandtotal__c == 86.4375, 
209                      'Order grand total was not $86.4375 but was ' 
210                      + order1.grandtotal__c);
211        System.assert(order1.shippingdiscount__c == 0, 
212                      'Order shipping discount was not $0 but was ' 
213                      + order1.shippingdiscount__c);
214        
215        // Add items to increase subtotal
216        item1 = new Item__C(Price__c = 25, weight__c = 20, quantity__c = 1, 
217                            Shipping_Invoice__C = order1.id);       
218        insert item1;
219
220        // Retrieve the order and verify free shipping is applicable
221        order1 = [SELECT id, subtotal__c, tax__c, shipping__c, totalweight__c, 
222                  grandtotal__c, shippingdiscount__c 
223                  FROM Shipping_Invoice__C 
224                  WHERE Id = :order1.Id];
225        
226        // Order total is now at $100, so free shipping should be enabled
227        System.assert(order1.subtotal__c == 100, 
228                      'Order subtotal was not $100, but was '+ order1.subtotal__c);
229        System.assert(order1.tax__c == 9.25, 
230                      'Order tax was not $9.25, but was ' + order1.tax__c);
231        System.assert(order1.shipping__c == 19.50, 
232                      'Order shipping was not $19.50, but was ' 
233                      + order1.shipping__c);
234        System.assert(order1.totalweight__c == 26.00, 
235                      'Order weight was not 26 but was ' + order1.totalweight__c);
236        System.assert(order1.grandtotal__c == 109.25, 
237                      'Order grand total was not $86.4375 but was ' 
238                      + order1.grandtotal__c);
239        System.assert(order1.shippingdiscount__c == -19.50, 
240                      'Order shipping discount was not -$19.50 but was ' 
241                      + order1.shippingdiscount__c);
242    }
243    
244     // Negative testing for inserting bad input
245    public static testmethod void testNegativeTests(){
246
247        // Create the shipping invoice. It's a best practice to either use defaults
248        // or to explicitly set all values to zero so as to avoid having
249        // extraneous data in your test.
250        Shipping_Invoice__C order1 = new Shipping_Invoice__C(subtotal__c = 0, 
251                          totalweight__c = 0, grandtotal__c = 0, 
252                          ShippingDiscount__c = 0, Shipping__c = 0, tax__c = 0);
253
254        // Insert the order and populate with items. 
255        insert Order1;
256        Item__c item1 = new Item__C(Price__c = -10, weight__c = 1, quantity__c = 1, 
257                                    Shipping_Invoice__C = order1.id);
258        Item__c item2 = new Item__C(Price__c = 25, weight__c = -2, quantity__c = 1, 
259                                    Shipping_Invoice__C = order1.id);
260        Item__c item3 = new Item__C(Price__c = 40, weight__c = 3, quantity__c = -1, 
261                                    Shipping_Invoice__C = order1.id);
262        Item__c item4 = new Item__C(Price__c = 40, weight__c = 3, quantity__c = 0, 
263                                    Shipping_Invoice__C = order1.id);
264
265        try{
266            insert item1;
267        }
268        catch(Exception e)
269        {
270            system.assert(e.getMessage().contains('Price must be non-negative'), 
271                         'Price was negative but was not caught');
272        }
273        
274        try{
275            insert item2;
276        }
277        catch(Exception e)
278        {
279            system.assert(e.getMessage().contains('Weight must be non-negative'), 
280                         'Weight was negative but was not caught');
281        }
282
283        try{
284            insert item3;
285        }
286        catch(Exception e)
287        {
288            system.assert(e.getMessage().contains('Quantity must be positive'), 
289                         'Quantity was negative but was not caught');
290        }
291        
292        try{
293            insert item4;
294        }
295        catch(Exception e)
296        {
297            system.assert(e.getMessage().contains('Quantity must be positive'), 
298                         'Quantity was zero but was not caught');
299        }
300    }
301}