Error "Table Definition for <entity> has not been inferred."

When trying to execute a query via GraphQL I get the following error:

{
  "errors": [
    {
      "message": "Table Definition for Todo has not been inferred.",
      "locations": [
        {
          "line": 2,
          "column": 3
        }
      ],
      "path": [
        "todos"
      ]
    }
  ]
}

the stack dump is:

Table Definition for Todo has not been inferred.
   at Azure.DataGateway.Service.Services.SqlMetadataProvider`3.GetSchemaName(String entityName) in w:\_git\_hawaii\hawaii-engine\DataGateway.Service\Services\MetadataProviders\SqlMetadataProvider.cs:line 101
   at Azure.DataGateway.Service.Resolvers.SqlQueryStructure..ctor(IResolverContext ctx, IDictionary`2 queryParams, ISqlMetadataProvider sqlMetadataProvider, IObjectField schemaField, FieldNode queryField, IncrementingInteger counter, String entityName) in w:\_git\_hawaii\hawaii-engine\DataGateway.Service\Resolvers\Sql Query Structures\SqlQueryStructure.cs:line 297
   at Azure.DataGateway.Service.Resolvers.SqlQueryStructure..ctor(IResolverContext ctx, IDictionary`2 queryParams, ISqlMetadataProvider sqlMetadataProvider) in w:\_git\_hawaii\hawaii-engine\DataGateway.Service\Resolvers\Sql Query Structures\SqlQueryStructure.cs:line 103
   at Azure.DataGateway.Service.Resolvers.SqlQueryEngine.ExecuteAsync(IMiddlewareContext context, IDictionary`2 parameters) in w:\_git\_hawaii\hawaii-engine\DataGateway.Service\Resolvers\SqlQueryEngine.cs:line 68
   at Azure.DataGateway.Service.Services.ResolverMiddleware.InvokeAsync(IMiddlewareContext context) in w:\_git\_hawaii\hawaii-engine\DataGateway.Service\Services\ResolverMiddleware.cs:line 71
   at HotChocolate.Utilities.MiddlewareCompiler`1.ExpressionHelper.AwaitTaskHelper(Task task)
   at HotChocolate.Execution.Processing.Tasks.ResolverTask.ExecuteResolverPipelineAsync(CancellationToken cancellationToken)
   at HotChocolate.Execution.Processing.Tasks.ResolverTask.TryExecuteAsync(CancellationToken cancellationToken)

everything works fine if I execute a REST request.

The configuration schema is

{
    "$schema": "hawaii.draft-01.schema.json",
    "data-source": {
        "database-type": "mssql",
        "connection-string": "Server=localhost;Database=HawaiiTest;User ID=sa;Password=Passw0rd!;TrustServerCertificate=true"
    },
    "runtime": {
        "host": {
            "mode": "development",
            "authentication": {
                "provider": "AzureAD",
                "jwt": {
                  "audience": "e98794ab-cdaa-4ed3-ad08-0552c47254e2",
                  "issuer": "https://login.microsoftonline.com/72f988bf-86f1-41af-91ab-2d7cd011db47/v2.0"
                }
            }
        },
        "rest": {
            "enabled": true
        },
        "graphql": {
            "enabled": true
        }
    },
    "entities": {
        "todo": {
            "source": "s002.todos",
            "relationships": {
                "category": {
                    "cardinality": "one",                    
                    "target.entity": "category"                    
                }
            },
            "permissions": [
                {
                    "role": "anonymous",
                    "actions": [
                        "*"
                    ]
                }
            ]
        },
        "category": {
            "source": "s002.categories",
            "relationships": {
                "todos": {
                    "cardinality": "many",                    
                    "target.entity": "todo"
                }
            },
            "permissions": [
                {
                    "role": "anonymous",
                    "actions": [
                        "*"
                    ]
                }
            ]
        }
    }
}

and the database

drop table if exists s002.todos
drop table if exists s002.categories
drop sequence if exists s002.globalId
go

create sequence s002.globalId
as int start with 10000
go

create table s002.categories
(
	id int not null primary key default (next value for s002.globalId),
	category nvarchar(100) not null unique
)
go

create table s002.todos
(
	id int not null 
		default (next value for s002.globalId)
		constraint pk__s002_todos primary key,
	category_id int not null 
		constraint fk__s002_todos2__s002_categories references s002.categories(id),
	title nvarchar(100) not null,
	[description] nvarchar(1000) null,
	completed bit not null default(0)
)
go

insert into s002.categories
	(id, category)
values
	(1, 'Family'),
	(2, 'Work'),
	(3, 'Hobby'),
	(4, 'Car'),
	(5, 'Bike')
go

insert into s002.todos
	(title, completed, category_id)
values
	('item-001', 0, 1),
	('item-002', 1, 1),
	('item-003', 1, 2),
	('item-004', 0, 3),
	('item-005', 1, 4),
	('item-006', 0, 3),
	('item-007', 0, 4),
	('item-008', 1, 4),
	('item-009', 1, 1),
	('item-010', 0, 2),
	('item-011', 1, 3),
	('item-012', 0, 4),
	('item-013', 1, 5),
	('item-015', 1, 1),
	('item-016', 0, 2),
	('item-017', 0, 4),
	('item-018', 1, 5),
	('item-019', 1, 3),
	('item-019', 1, 1),
	('item-020', 0, 2)

[yorek]

Let’s generate the entity name using the same casing used in the configuration file

[seantleonard]

One thing to keep in mind when handling entities and fields for GraphQL is the GraphQL Specification requirements for names: http://spec.graphql.org/draft/#sec-Names

This means that we will need make sure to enforce those constraints in our config when naming entities and fields.