public Changes <TResource> BuildChanges <TResource>(DocumentData data, IResourceMapping mapping)
{
var changes = new Changes <TResource>();
if (data.Id.HasValue)
{
changes.AddChange(resource => mapping.SetId(resource, data.Id.Value));
}
if (data.Attributes != null)
{
foreach (var attribute in data.Attributes)
{
var attributeType = mapping.GetAttributeType(attribute.Key);
if (attributeType == null)
{
continue;
}
var value = attribute.Value.ParseAs(attributeType, _jsonSerializer);
changes.AddChange(resource => mapping.SetAttributeValue(resource, attribute.Key, value));
}
}
if (data.Relationships != null)
{
foreach (var relation in data.Relationships)
{
var relationResourceType = mapping.GetResourceTypeOfRelation(relation.Key);
if (relationResourceType == null)
{
throw new JsonApiException(CausedBy.Client, $"Unknown relation {relation.Key}");
}
var relationResourceTypeName = GetResourceTypeName(relationResourceType);
if (mapping.IsHasManyRelation(relation.Key))
{
var relationData = relation.Value.Data.ParseAs <IEnumerable <RelationData> >(_jsonSerializer);
if (relationData != null)
{
if (relationData.Any(x => !x.Type.Equals(relationResourceTypeName)))
{
throw new JsonApiFormatException(CausedBy.Client, $"Not all relations specified for {relation.Key} are of the type {relationResourceTypeName}");
}
var relationIds = relationData.Select(x => x.Id);
changes.AddChange(resource => mapping.SetRelationValue(resource, relation.Key, relationIds));
}
}
else
{
var relationData = relation.Value.Data.ParseAs <RelationData>(_jsonSerializer);
if (relationData != null)
{
if (!relationData.Type.Equals(relationResourceTypeName))
{
throw new JsonApiFormatException(CausedBy.Client, $"Relation type specified for {relation.Key} must be {relationResourceTypeName} instead of {relationData.Type}");
}
var relationId = relationData.Id;
changes.AddChange(resource => mapping.SetRelationValue(resource, relation.Key, relationId));
}
}
}
}
return(changes);
}
