/// <summary>
/// Returns an <see cref="List{TEntity}"/> based on a custom filtering function applied to the query, as well as
/// optional select and expand arguments, checking the user READ permissions along the way
/// </summary>
/// <param name="filterFunc">Allows any kind of filtering on the query</param>
/// <param name="expand">Optional expand argument</param>
/// <param name="select">Optional select argument</param>
/// <param name="orderby">Optional select argument</param>
/// <param name="permissionsFilter">Optional filter argument, if null is passed the q</param>
/// <param name="cancellation">Optional select argument</param>
protected async Task <List <TEntity> > GetEntitiesByCustomQuery(
Func <Query <TEntity>, Query <TEntity> > filterFunc,
ExpressionExpand expand,
ExpressionSelect select,
ExpressionOrderBy orderby,
ExpressionFilter permissionsFilter,
CancellationToken cancellation)
{
// Prepare a query of the result, and clone it
var repo = GetRepository();
var query = repo.Query <TEntity>();
// Apply custom filter function
query = filterFunc(query);
// Apply read permissions
permissionsFilter ??= await UserPermissionsFilter(Constants.Read, cancellation);
query = query.Filter(permissionsFilter);
// Expand, Select and Order the result as specified in the OData agruments
var expandedQuery = query.Expand(expand).Select(select).OrderBy(orderby ?? ExpressionOrderBy.Parse("Id")); // Required
// Load the result into memory
var data = await expandedQuery.ToListAsync(cancellation); // this is potentially unordered, should that be a concern?
// TODO: This is slow and unused
// Apply the permission masks (setting restricted fields to null) and adjust the metadata accordingly
// await ApplyReadPermissionsMask(data, query, permissions, GetDefaultMask(), cancellation);
// Return
return(data);
}
/// <summary>
/// Returns an <see cref="List{TEntity}"/> based on a custom <paramref name="filterFunc"/> applied to the query, as well as
/// optional <paramref name="expand"/> and <paramref name="select"/> arguments, checking the user's READ permissions along the way.
/// </summary>
/// <param name="filterFunc">Allows any kind of filtering on the query</param>
/// <param name="expand">Optional expand argument.</param>
/// <param name="select">Optional select argument.</param>
/// <param name="orderby">Optional orderby argument.</param>
/// <param name="permissionsFilter">Optional filter argument, if null is passed the query uses the read permissions filter of the current user.</param>
/// <param name="cancellation">The cancellation instruction.</param>
protected async Task <List <TEntity> > GetEntitiesByCustomQuery(
Func <EntityQuery <TEntity>, EntityQuery <TEntity> > filterFunc,
ExpressionExpand expand,
ExpressionSelect select,
ExpressionOrderBy orderby,
ExpressionFilter permissionsFilter,
CancellationToken cancellation)
{
// Prepare a query of the result, and clone it
var factory = QueryFactory();
var query = factory.EntityQuery <TEntity>();
// Apply custom filter function
query = filterFunc(query);
// Apply read permissions
permissionsFilter ??= await UserPermissionsFilter(PermissionActions.Read, cancellation);
query = query.Filter(permissionsFilter);
// Expand, Select and Order the result as specified in the Queryex agruments
var expandedQuery = query.Expand(expand).Select(select).OrderBy(orderby ?? ExpressionOrderBy.Parse("Id")); // Required
// Load the result into memory
var data = await expandedQuery.ToListAsync(QueryContext(), cancellation); // this is potentially unordered, should that be a concern?
// Return
return(data);
}
public async Task <IEnumerable <TDto> > QueryAsync(string[] fields)
{
CheckNull(fields);
var tEntities = await Repository.QueryAsync();
var typeMap = Mapper.ConfigurationProvider.ResolveTypeMap(typeof(TDto), typeof(TEntity));
var selector = ExpressionSelect.CreateSelecter <TEntity, TDto>(typeMap, fields.ToList());
return(tEntities.Select(selector).AsEnumerable());
// return Mapper.Map<IEnumerable<TDto>>(tEntities.AsEnumerable());
}
public async Task <IEnumerable <TDto> > QueryAsync(Expression <Func <TDto, bool> > whereExpression, string[] fields)
{
CheckNull(fields);
ExpressionConverter <TDto, TEntity> expressionConverter = new ExpressionConverter <TDto, TEntity>(Mapper);
var newExperssion = (Expression <Func <TEntity, bool> >)expressionConverter.Visit(whereExpression);
var tEntities = await Repository.QueryAsync(newExperssion);
var typeMap = Mapper.ConfigurationProvider.ResolveTypeMap(typeof(TDto), typeof(TEntity));
var selector = ExpressionSelect.CreateSelecter <TEntity, TDto>(typeMap, fields.ToList());
return(tEntities.Select(selector).AsEnumerable());
}
/// <summary>
/// Returns a <see cref="List{TEntity}"/> as per the Ids and the specifications in the <see cref="ExpressionExpand"/> and <see cref="ExpressionSelect"/>,
/// after verifying the user's permissions, returns the entities in the same order as the supplied Ids.
/// If null was supplied for permission filter, the function by default uses the filter for the read permissions filter
/// </summary>
protected virtual async Task <List <TEntity> > GetEntitiesByIds(
List <TKey> ids,
ExpressionExpand expand,
ExpressionSelect select,
ExpressionFilter permissionsFilter,
CancellationToken cancellation)
{
if (ids == null || ids.Count == 0)
{
return(new List <TEntity>());
}
else
{
var data = await GetEntitiesByCustomQuery(q => q.FilterByIds(ids), expand, select, null, permissionsFilter, cancellation);
// If the data is only
if (ids.Count == 1 && data.Count == 1)
{
// No need to sort
return(data);
}
else
{
// Sort the entities according to the original Ids, as a good practice
TEntity[] dataSorted = new TEntity[ids.Count];
Dictionary <TKey, TEntity> dataDic = data.ToDictionary(e => e.Id);
for (int i = 0; i < ids.Count; i++)
{
var id = ids[i];
if (dataDic.TryGetValue(id, out TEntity entity))
{
dataSorted[i] = entity;
}
}
return(dataSorted.Where(e => e != null).ToList());
}
}
}