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added condition to lazy loading of relationship objects

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no db calls will be made if foreign key is 0.
This commit is contained in:
kay.one 2013-05-21 22:30:54 -07:00
commit 28b47b415f
4 changed files with 56 additions and 34 deletions
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20
Marr.Data/LazyLoaded.cs
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@ -70,14 +70,15 @@ namespace Marr.Data
internal class LazyLoaded<TParent, TChild> : LazyLoaded<TChild>
{
private TParent _parent;
private Func<IDataMapper, TParent, TChild> _query;
private Func<IDataMapper> _dbCreator;
internal LazyLoaded(Func<IDataMapper, TParent, TChild> query)
: base()
private readonly Func<IDataMapper, TParent, TChild> _query;
private readonly Func<TParent, bool> _condition;
internal LazyLoaded(Func<IDataMapper, TParent, TChild> query, Func<TParent, bool> condition = null)
{
_query = query;
_condition = condition;
}
public LazyLoaded(TChild val)
@ -107,11 +108,16 @@ namespace Marr.Data
{
if (!_isLoaded)
{
using (IDataMapper db = _dbCreator())
if (_condition != null && _condition(_parent))
{
_child = _query(db, _parent);
_isLoaded = true;
using (IDataMapper db = _dbCreator())
{
_child = _query(db, _parent);
}
}
_child = default(TChild);
_isLoaded = true;
}
}

5
Marr.Data/Mapping/RelationshipBuilder.cs
View file

@ -62,12 +62,13 @@ namespace Marr.Data.Mapping
/// </summary>
/// <typeparam name="TChild"></typeparam>
/// <param name="query"></param>
/// <param name="condition">condition in which a child could exist. eg. avoid call to db if foreign key is 0 or null</param>
/// <returns></returns>
public RelationshipBuilder<TEntity> LazyLoad<TChild>(Func<IDataMapper, TEntity, TChild> query)
public RelationshipBuilder<TEntity> LazyLoad<TChild>(Func<IDataMapper, TEntity, TChild> query, Func<TEntity, bool> condition = null)
{
AssertCurrentPropertyIsSet();
Relationships[_currentPropertyName].LazyLoaded = new LazyLoaded<TEntity, TChild>(query);
Relationships[_currentPropertyName].LazyLoaded = new LazyLoaded<TEntity, TChild>(query, condition);
return this;
}