Respect [JsonPropertyName] in query translation

Closes npgsql#1419

Author: roji

src/EFCore.PG/Query/ExpressionTranslators/Internal/NpgsqlJsonPocoTranslator.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Linq;
 using System.Reflection;
+using System.Text.Json.Serialization;
 using JetBrains.Annotations;
 using Microsoft.EntityFrameworkCore.Query;
 using Microsoft.EntityFrameworkCore.Query.SqlExpressions;
@@ -28,7 +29,16 @@ public NpgsqlJsonPocoTranslator(
         }
 
         public virtual SqlExpression Translate(SqlExpression instance, MemberInfo member, Type returnType)
-            => TranslateMemberAccess(instance, _sqlExpressionFactory.Constant(member.Name), returnType);
+            => instance?.TypeMapping is NpgsqlJsonTypeMapping || instance is PostgresJsonTraversalExpression
+                ? TranslateMemberAccess(
+                    instance,
+                    _sqlExpressionFactory.Constant(
+                        member.GetCustomAttribute<JsonPropertyNameAttribute>() is JsonPropertyNameAttribute
+                            attribute
+                            ? attribute.Name
+                            : member.Name),
+                    returnType)
+                : null;
 
         public virtual SqlExpression TranslateMemberAccess(
             [NotNull] SqlExpression instance, [NotNull] SqlExpression member, [NotNull] Type returnType)

test/EFCore.PG.FunctionalTests/Query/JsonPocoQueryTest.cs

@@ -2,6 +2,7 @@
 using System.ComponentModel.DataAnnotations.Schema;
 using System.Linq;
 using System.Text.Json;
+using System.Text.Json.Serialization;
 using Microsoft.EntityFrameworkCore;
 using Microsoft.EntityFrameworkCore.TestUtilities;
 using Npgsql.EntityFrameworkCore.PostgreSQL.TestUtilities;
@@ -70,7 +71,7 @@ public void Literal()
             AssertSql(
                 @"SELECT j.""Id"", j.""Customer"", j.""ToplevelArray""
 FROM ""JsonbEntities"" AS j
-WHERE j.""Customer"" = '{""Name"":""Test customer"",""Age"":80,""ID"":""00000000-0000-0000-0000-000000000000"",""IsVip"":false,""Statistics"":null,""Orders"":null}'");
+WHERE j.""Customer"" = '{""Name"":""Test customer"",""Age"":80,""ID"":""00000000-0000-0000-0000-000000000000"",""is_vip"":false,""Statistics"":null,""Orders"":null}'");
         }
 
         [Fact]
@@ -163,7 +164,7 @@ public void Bool_output()
             AssertSql(
                 @"SELECT j.""Id"", j.""Customer"", j.""ToplevelArray""
 FROM ""JsonbEntities"" AS j
-WHERE CAST(j.""Customer""->>'IsVip' AS boolean)
+WHERE CAST(j.""Customer""->>'is_vip' AS boolean)
 LIMIT 2");
         }
 
@@ -639,6 +640,7 @@ public class Customer
             public string Name { get; set; }
             public int Age { get; set; }
             public Guid ID { get; set; }
+            [JsonPropertyName("is_vip")]
             public bool IsVip { get; set; }
             public Statistics Statistics { get; set; }
             public Order[] Orders { get; set; }