/// <summary>
/// Adds the Facet in the order it was added
/// </summary>
/// <param name="property">The property key to facet on</param>
/// <returns><see cref="FacetBuilder{T}"/></returns>
public virtual FacetBuilder <T> On(string property)
{
if (String.IsNullOrEmpty(property))
{
return(this);
}
var facet = new FacetOn(property);
this.On(facet);
return(this);
}
/// <summary>
/// Adds the Facet by a property of the <see cref="T"/> of <see cref="SearchResultItem"/>
/// <para>If the <see cref="IndexFieldAttribute"/> does not exist on the property,
/// the default will be a lowercase name of the property</para>
/// </summary>
/// <param name="expression">The expression of the property</param>
/// <exception cref="ArgumentNullException">Expression cannot be null</exception>
/// <exception cref="ArgumentException">Expression cannot refer to a method</exception>
/// <exception cref="ArgumentException">Expression cannot refer to a field</exception>
/// <returns><see cref="FacetBuilder{T}"/></returns>
public virtual FacetBuilder <T> On <TProperty>(Expression <Func <T, TProperty> > expression)
{
if (expression == null)
{
throw new ArgumentNullException(nameof(expression));
}
// Extension to convert the expression into the Property needed
var propInfo = expression.ToPropertyInfo();
/**
* Attempt to get the IndexFieldAttribute on the Property, if it
* doesn't exist, just take the name of the property
*/
var indexField = propInfo.GetCustomAttribute <IndexFieldAttribute>();
var facetKey = indexField != null ? indexField.IndexFieldName : propInfo.Name.ToLower();
var facetOn = new FacetOn(facetKey);
return(this.On(facetOn));
}