/// <summary>
/// Retrieves a list of groups matching the criteria specified via method parameters.
/// </summary>
/// <param name="category">Category name.</param>
/// <param name="categoryId">Category Id</param>
/// <param name="pageNumber">Page number.</param>
/// <param name="pageSize">Page size.</param>
/// <param name="recordCount">Record count.</param>
/// <returns>List of groups.</returns>
public List<MonoSoftware.MonoX.Repositories.SnGroupDTO> GetPopularGroups(string category, Guid categoryId, int pageNumber, int pageSize, out int recordCount)
{
RelationPredicateBucket filter = new RelationPredicateBucket();
//introduced to filter out groups by languages and applications
filter.Relations.Add(SnGroupEntity.Relations.SnGroupCategoryEntityUsingGroupCategoryId, JoinHint.Left);
//Note: MonoX supports the multi application environment so general filter for all DB access calls should contain the application id filter
filter.PredicateExpression.Add(SnGroupCategoryFields.ApplicationId == MonoSoftware.MonoX.Repositories.MembershipRepository.GetInstance().GetApplicationId());
//Note: MonoX in supports the multi language environment so general filter for all DB access calls should contain the language id filter
filter.PredicateExpression.Add(SnGroupCategoryFields.LanguageId == LocalizationUtility.GetCurrentLanguageId());
//Filter groups by category
if (categoryId != Guid.Empty)
{
filter.PredicateExpression.Add(SnGroupFields.GroupCategoryId == categoryId);
}
if (!String.IsNullOrEmpty(category))
{
filter.PredicateExpression.Add(SnGroupCategoryFields.Slug == category);
}
IPrefetchPath2 prefetch = new PrefetchPath2((int)EntityType.SnGroupEntity);
prefetch.Add(SnGroupEntity.PrefetchPathSnGroupCategory);
//Fetch a record from the members table only for the current user so his status could be read
Guid uid = SecurityUtility.GetUserId();
if (!Guid.Empty.Equals(uid))
{
PredicateExpression memberFilter = new PredicateExpression(SnGroupMemberFields.UserId == uid);
prefetch.Add(SnGroupEntity.PrefetchPathSnGroupMembers, 1, memberFilter);
}
#region Popular groups sorter
const string memberCountField = "MemberCountField";
const string memberCountTableName = "MemberCountTable";
EntityFields2 memberFields = new EntityFields2(2);
memberFields.DefineField(SnGroupMemberFields.GroupId, 0);
memberFields.DefineField(SnGroupMemberFields.Id, 1, memberCountField, AggregateFunction.Count);
DerivedTableDefinition memberCountTable = new DerivedTableDefinition(memberFields, memberCountTableName, null, new GroupByCollection(memberFields[0]));
IDynamicRelation memberCountRelation = new DynamicRelation(memberCountTable, JoinHint.Right, MonoSoftware.MonoX.DAL.EntityType.SnGroupEntity, String.Empty, SnGroupMemberFields.GroupId.SetObjectAlias(memberCountTable.Alias) == SnGroupFields.Id);
filter.Relations.Add(memberCountRelation);
ISortExpression sorter = new SortExpression(new SortClause(new EntityField2(memberCountField, null).SetObjectAlias(memberCountTableName), null, SortOperator.Descending));
#endregion
EntityCollection<SnGroupEntity> groups = new EntityCollection<SnGroupEntity>();
//Fetch the group collection
FetchEntityCollection(groups, filter, 0, sorter, prefetch, pageNumber, pageSize);
//Fetch the group total count used by paging
recordCount = GetDbCount(groups, filter);
//Transfer group entities to the DTO
List<MonoSoftware.MonoX.Repositories.SnGroupDTO> toReturn = groups.Select(group => new MonoSoftware.MonoX.Repositories.SnGroupDTO(group)).ToList<MonoSoftware.MonoX.Repositories.SnGroupDTO>();
return toReturn;
}
