/// <summary>
/// Adds offset pagination support to the field. Rewrites the type to a connection type and
/// registers the mongo pagination handler
/// </summary>
/// <param name="descriptor">The descriptor of the field</param>
/// <param name="type">
/// The schema type of the entity. Not a connection type
/// </param>
/// <param name="entityType">The type of the entity</param>
/// <param name="options">The options for pagination</param>
/// <returns>The <paramref name="descriptor"/></returns>
public static IObjectFieldDescriptor UseMongoDbOffsetPaging(
this IObjectFieldDescriptor descriptor,
Type?type = null,
Type?entityType = null,
PagingOptions options = default) =>
descriptor.UseOffsetPaging(
type,
entityType,
(services, sourceType) => services.GetService <MongoDbOffsetPagingProvider>() ??
new MongoDbOffsetPagingProvider(),
options);
private static void ApplyConfigurationToFieldDescriptor <TEntity>(
IObjectFieldDescriptor descriptor,
Type?type,
bool usePaging = false,
bool useOffsetPaging = false)
{
if (usePaging)
{
descriptor.UsePaging(nodeType: type ?? typeof(ObjectType <TEntity>));
}
if (useOffsetPaging)
{
descriptor.UseOffsetPaging(type ?? typeof(ObjectType <TEntity>));
}
descriptor
.Use(
next => async context =>
{
await next(context);
if (context.Result is IQueryable <TEntity> queryable)
{
try
{
context.ContextData["sql"] = queryable.ToQueryString();
}
catch (Exception ex)
{
context.ContextData["sql"] = ex.Message;
}
context.Result = await queryable.ToListAsync();
}
if (context.Result is IExecutable executable)
{
try
{
context.ContextData["sql"] = executable.Print();
}
catch (Exception ex)
{
context.ContextData["sql"] = ex.Message;
}
}
})
.UseProjection()
.UseFiltering()
.UseSorting();
}