/// <summary>
/// Creates a project many query against the specified database.
/// </summary>
/// <typeparam name="TModel">The type of the model.</typeparam>
/// <typeparam name="TMetadata">The type of the metadata.</typeparam>
/// <typeparam name="TProjection">The type of the projection.</typeparam>
/// <param name="database">The database.</param>
/// <returns>A new project many query.</returns>
public static ProjectManyQueryAsync <TModel, TMetadata, TProjection> ProjectManyAsync <TModel, TMetadata, TProjection>(
MongoDatabase database)
{
var projectManyQueryAsync = ProjectManyAsync <StorageModel <TModel, TMetadata>, TProjection>(database);
ProjectManyQueryAsync <TModel, TMetadata, TProjection> queryAsync = async(where, project, collectionName, cancellationToken) =>
{
var modelTypeName = string.IsNullOrWhiteSpace(collectionName) ? typeof(TModel).Name : collectionName;
return(await projectManyQueryAsync(where, project, modelTypeName, cancellationToken));
};
return(queryAsync);
}
/// <summary>
/// Creates a project many query against the specified database.
/// </summary>
/// <typeparam name="TModel">The type of the model.</typeparam>
/// <typeparam name="TProjection">The type of the projection.</typeparam>
/// <param name="database">The database.</param>
/// <returns>A new project many query.</returns>
public static ProjectManyQueryAsync <TModel, TProjection> ProjectManyAsync <TModel, TProjection>(MongoDatabase database)
{
if (database == null)
{
throw new ArgumentNullException(nameof(database));
}
ProjectManyQueryAsync <TModel, TProjection> queryAsync = async(where, project, collectionName, cancellationToken) =>
{
if (where == null)
{
throw new ArgumentNullException((nameof(where)));
}
if (project == null)
{
throw new ArgumentNullException((nameof(project)));
}
var modelTypeName = string.IsNullOrWhiteSpace(collectionName) ? typeof(TModel).Name : collectionName;
var client = database.CreateClient();
var collection = client.GetCollection <TModel>(modelTypeName);
var projectionDefinition = Builders <TModel> .Projection.Expression(project);
var findOptions = new FindOptions <TModel, TProjection>()
{
Projection = projectionDefinition
};
var findResults = await collection.FindAsync(where, findOptions, cancellationToken);
return(await findResults.ToListAsync(cancellationToken));
};
return(queryAsync);
}
