create a feed query builder

Author: shizunge

model/feed.go

@@ -15,8 +15,11 @@ import (
 
 // List of supported schedulers.
 const (
-	SchedulerRoundRobin     = "round_robin"
-	SchedulerEntryFrequency = "entry_frequency"
+	SchedulerRoundRobin         = "round_robin"
+	SchedulerEntryFrequency     = "entry_frequency"
+	// Default settings for the feed query builder
+	DefaultFeedSorting          = "parsing_error_count"
+	DefaultFeedSortingDirection = "desc"
 )
 
 // Feed represents a feed in the application.

storage/entry.go

@@ -26,9 +26,9 @@ func (s *Storage) CountAllEntries() map[string]int64 {
 	defer rows.Close()
 
 	results := make(map[string]int64)
-	results["unread"] = 0
-	results["read"] = 0
-	results["removed"] = 0
+	results[model.EntryStatusUnread] = 0
+	results[model.EntryStatusRead] = 0
+	results[model.EntryStatusRemoved] = 0
 
 	for rows.Next() {
 		var status string
@@ -41,7 +41,7 @@ func (s *Storage) CountAllEntries() map[string]int64 {
 		results[status] = count
 	}
 
-	results["total"] = results["unread"] + results["read"] + results["removed"]
+	results["total"] = results[model.EntryStatusUnread] + results[model.EntryStatusRead] + results[model.EntryStatusRemoved]
 	return results
 }
 

storage/entry_query_builder.go

@@ -269,7 +269,7 @@ func (e *EntryQueryBuilder) GetEntries() (model.Entries, error) {
 	entries := make(model.Entries, 0)
 	for rows.Next() {
 		var entry model.Entry
-		var iconID interface{}
+		var iconID sql.NullInt64
 		var tz string
 
 		entry.Feed = &model.Feed{}