[tracker] rss: cater for nmo:communicationChannel cardinality changes

[Carlos Garnacho <carlosg src gnome org>]

commit f8fd53949a69c01d4ac3acc4f18b0885631e61ca
Author: Carlos Garnacho <carlosg gnome org>
Date:   Sun Jul 26 12:46:45 2015 +0200

    rss: cater for nmo:communicationChannel cardinality changes
    
    Now that mfo:FeedMessages can reference multiple mfo:FeedChannels,
    ensure we set link messages with all channels we receive these from.

 src/miners/rss/tracker-miner-rss.c |   18 +++++++++++++++++-
 1 files changed, 17 insertions(+), 1 deletions(-)
---
diff --git a/src/miners/rss/tracker-miner-rss.c b/src/miners/rss/tracker-miner-rss.c
index b8f0e11..0706a6b 100644
--- a/src/miners/rss/tracker-miner-rss.c
+++ b/src/miners/rss/tracker-miner-rss.c
@@ -713,12 +713,27 @@ sparql_add_contact (TrackerSparqlBuilder *sparql,
 }
 
 static gchar *
+feed_message_create_update_channel_query (const gchar  *item_urn,
+                                          GrssFeedItem *item)
+{
+       GrssFeedChannel *channel;
+       const gchar *channel_urn;
+
+       channel = grss_feed_item_get_parent (item);
+       channel_urn = g_object_get_data (G_OBJECT (channel), "subject");
+
+       return g_strdup_printf ("INSERT SILENT { <%s> nmo:communicationChannel <%s> }",
+                               item_urn, channel_urn);
+}
+
+static gchar *
 feed_message_create_delete_properties_query (const gchar *item_urn)
 {
        return g_strdup_printf ("DELETE { <%s> ?p ?o }"
                                "WHERE  { <%s> a mfo:FeedMessage ;"
                                "              ?p ?o ."
-                               "              FILTER (?p != rdf:type)"
+                               "              FILTER (?p != rdf:type &&"
+                               "                      ?p != nmo:communicationChannel)"
                                "}", item_urn, item_urn);
 }
 
@@ -1001,6 +1016,7 @@ check_feed_items_cb (GObject      *source_object,
 
                if (time <= grss_feed_item_get_publish_time (item)) {
                        g_debug ("Item '%s' already up to date", url);
+                       g_ptr_array_add (array, feed_message_create_update_channel_query (urn, item));
                } else {
                        g_debug ("Updating item '%s'", url);