Mapper.apex

Mapper.apex is a library to help converting one object to another.

Why Mapper.apex?

The primary purpose of Mapper.apex is to ease the pain of converting between custom DTO objects and SObjects. Furthermore, Mapper.apex gives you more power when converting the objects, as well as a helpful Mapper.DTO object to easily manipulate nested Map objects.

Dependencies

Mapper.apex has a dependency over R.apex. Please include it before including Mapper.apex.

Examples

Simple Conversion

We can convert an Account to a custom AccountDTO like this:

Account acc = ...;
Mapper m = new Mapper()
    .mapField('name', 'Name')
    .mapField('description', 'Description')
    .toObject(AccountDTO.class);
AccountDTO dto = (AccountDTO)m.run(acc);
// Create AccountDTO with fields 'name' and 'description'

Reversed Conversion

We can easily convert the AccountDTO back to Account.

Mapper reversed = m.reverseToSObject(Account.class);
Account acc = (Account)reversed.run(dto);
// Map the AccountDTO back to Account

Value Conversion

We can transform the values when converting the objects.

Mapper m = new Mapper()
    .mapField('name', 'Name', R.prepend.apply('Mr. '))
    .toMap();
Map<String, Object> data = (Map<String, Object>)m.run(acc);
// Create a map containing 'name' with the value prepended with 'Mr. '

Multiple Fields Conversion

We can transform the values from multiple fields when converting the objects.

Mapper m = new Mapper()
    .mapField('desc', 'Name', 'Description', R.concat)
    .toMap();
Map<String, Object> data = (Map<String, Object>)m.run(acc);
// Create a map containing 'desc' with the value of 'Name'
// and 'Description' values concatenated

Nested Fields Conversion

We can transform the values of nested fields when converting the objects.

Mapper m = new Mapper()
    .mapField('person.name', 'Account.Name')
    .toMap();
Map<String, Object> data = (Map<String, Object>)m.run(src);
// Create a map with nested maps, 'person => name' with the value
// of 'Account => Name' from the source map

Multiple Objects Conversion

We can transform the values from multiple objects when converting the objects.

Mapper m = new Mapper()
    .inputAs('src1', 'src2')
    .mapField('name', 'src1.Name')
    .mapField('desc', 'src2.Description')
    .toMap();
Map<String, Object> data = (Map<String, Object>)m.run(src1, src2);
// Create a map containing 'name' and 'desc' with values
// from two source objects

Mapper.DTO

We can use Mapper.DTO objects to manipulate nested maps.

Mapper.DTO d = new Mapper.DTO();
d.setList('person.children', new List<Object>{});
Integer salary = d.getInteger('person.job.salary');