Add code to migrate database model

Add code to migrate database model when `authors` column is not present in the index
This recreates `search` table and resets the articles index
Added missing or code in error

ArticlesDatabase/Sources/ArticlesDatabase/ArticlesDatabase.swift

@@ -63,6 +63,7 @@ public final class ArticlesDatabase {
 	}
 
 	private let articlesTable: ArticlesTable
+    private let searchTable: SearchTable
 	private let queue: DatabaseQueue
 	private let operationQueue = MainThreadOperationQueue()
 	private let retentionStyle: RetentionStyle
@@ -71,6 +72,7 @@ public final class ArticlesDatabase {
 		let queue = DatabaseQueue(databasePath: databaseFilePath)
 		self.queue = queue
 		self.articlesTable = ArticlesTable(name: DatabaseTableName.articles, accountID: accountID, queue: queue, retentionStyle: retentionStyle)
+        self.searchTable = SearchTable(queue: queue, articlesTable: self.articlesTable)
 		self.retentionStyle = retentionStyle
 
 		try! queue.runCreateStatements(ArticlesDatabase.tableCreationStatements)
@@ -81,6 +83,9 @@ public final class ArticlesDatabase {
 			}
 			database.executeStatements("CREATE INDEX if not EXISTS articles_searchRowID on articles(searchRowID);")
 			database.executeStatements("DROP TABLE if EXISTS tags;DROP INDEX if EXISTS tags_tagName_index;DROP INDEX if EXISTS articles_feedID_index;DROP INDEX if EXISTS statuses_read_index;DROP TABLE if EXISTS attachments;DROP TABLE if EXISTS attachmentsLookup;")
+            if !self.searchTable.containsColumn("authors", in: database) {
+                database.executeStatements("DROP TABLE if EXISTS search;CREATE VIRTUAL TABLE if not EXISTS search using fts4(title, body, authors);UPDATE articles SET searchRowID = null;")
+            }
 		}
 
 		DispatchQueue.main.async {

ArticlesDatabase/Sources/ArticlesDatabase/ArticlesTable.swift

@@ -158,8 +158,8 @@ final class ArticlesTable: DatabaseTable {
             art.contentText,
             art.summary,
             art.searchRowID,
-            (SELECT GROUP_CONCAT(name SEPARATOR ' ')
-            FROM authorLookup as autL
+            (SELECT GROUP_CONCAT(name, ' ')
+            FROM authorsLookup as autL
             JOIN authors as aut ON autL.authorID = aut.authorID
             WHERE art.articleID = autL.articleID
             GROUP BY autl.articleID) as authors

ArticlesDatabase/Sources/ArticlesDatabase/SearchTable.swift

@@ -61,7 +61,7 @@ final class ArticleSearchInfo: Hashable {
 	// MARK: Equatable
 
 	static func == (lhs: ArticleSearchInfo, rhs: ArticleSearchInfo) -> Bool {
-		return lhs.articleID == rhs.articleID && lhs.title == rhs.title && lhs.contentHTML == rhs.contentHTML && lhs.contentText == rhs.contentText && lhs.summary == rhs.summary && lhs.searchRowID == rhs.searchRowID
+        return lhs.articleID == rhs.articleID && lhs.title == rhs.title && lhs.authorsNames == rhs.authorsNames && lhs.contentHTML == rhs.contentHTML && lhs.contentText == rhs.contentText && lhs.summary == rhs.summary && lhs.searchRowID == rhs.searchRowID
 	}
 }
 
@@ -203,7 +203,7 @@ private extension SearchTable {
 			return nil
 		}
 		let placeholders = NSString.rs_SQLValueList(withPlaceholders: UInt(searchRowIDs.count))!
-		let sql = "select rowid, title, body from \(name) where rowid in \(placeholders);"
+		let sql = "select rowid, title, body, authors from \(name) where rowid in \(placeholders);"
 		guard let resultSet = database.executeQuery(sql, withArgumentsIn: searchRowIDs) else {
 			return nil
 		}