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PersonEntityMapper.cs
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PersonEntityMapper.cs
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using Dapper.GraphQL;
using Dapper.GraphQL.Test.Models;
using System.Linq;
namespace Dapper.GraphQL.Test.EntityMappers
{
public class PersonEntityMapper :
DeduplicatingEntityMapper<Person>
{
private CompanyEntityMapper companyEntityMapper;
private PersonEntityMapper personEntityMapper;
public PersonEntityMapper()
{
// Deduplicate entities using MergedToPersonId instead of Id.
PrimaryKey = p => p.MergedToPersonId;
}
public override Person Map(EntityMapContext context)
{
// Avoid creating the mappers until they're used
// NOTE: this avoids an infinite loop (had these been created in the ctor)
if (companyEntityMapper == null)
{
companyEntityMapper = new CompanyEntityMapper();
}
if (personEntityMapper == null)
{
personEntityMapper = new PersonEntityMapper();
}
// NOTE: Order is very important here. We must map the objects in
// the same order they were queried in the QueryBuilder.
// Start with the person, and deduplicate
var person = Deduplicate(context.Start<Person>());
var company = context.Next<Company>("companies", companyEntityMapper);
var email = context.Next<Email>("emails");
var phone = context.Next<Phone>("phones");
var supervisor = context.Next<Person>("supervisor", personEntityMapper);
var careerCounselor = context.Next<Person>("careerCounselor", personEntityMapper);
if (person != null)
{
if (company != null &&
// Eliminate duplicates
!person.Companies.Any(c => c.Id == company.Id))
{
person.Companies.Add(company);
}
if (email != null &&
// Eliminate duplicates
!person.Emails.Any(e => e.Address == email.Address))
{
person.Emails.Add(email);
}
if (phone != null &&
// Eliminate duplicates
!person.Phones.Any(p => p.Number == phone.Number))
{
person.Phones.Add(phone);
}
person.Supervisor = person.Supervisor ?? supervisor;
person.CareerCounselor = person.CareerCounselor ?? careerCounselor;
}
return person;
}
}
}