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-- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to u1db-qt in Ubuntu. https://bugs.launchpad.net/bugs/1214538 Title: Not indexing documents unless all fields are in the index expression clause Status in U1DB Qt/ QML: Fix Committed Status in “u1db-qt” package in Ubuntu: Fix Released Bug description: It seems that queries only return results of documents, where all the document's fields are indexed [regardless of whether or not those fields are being queried]. I've included a number of examples below, I hope they clarify the situation: Examples: Database definition: U1db.Database { id: theDB path: "indextest.db" } Two sample documents: the first has only a "title" field, the second has both "title" and "num" fields: U1db.Document { database: theDB create: true docId: "vic" defaults: {"title": "vic"} } U1db.Document { database: theDB create: true docId: "xqwzts" defaults: { "title": "xqwzts", "num": "123" } } Index only the title field since it is what I care about querying: U1db.Index { database: theDB id: theIndex expression: ["title"] } An empty query which should match all documents in the index: U1db.Query { id: theQuery index: theIndex } Expected result: both documents should be returned Action result: only the first document is returned Detailed output: JSON.stringify(theDB.listDocs()) {"0":"vic","1":"xqwzts"} JSON.stringify(theIndex) {"database":{"error":"","objectName":"","path":"indextest.db"},"name":"","objectName":"","expression":{"0":"title"}} JSON.stringify(theQuery) {"index":{"database":{"error":"","objectName":"","path":"indextest.db"},"name":"","objectName":"","expression":{"0":"title"}},"objectName":"","results":[{"title":"vic"}],"documents":{"0":"vic"}} Specifying the query to search for title = "*" makes no difference: U1db.Query { id: theQuery index: theIndex query: [{"title": "*"}] } JSON.stringify(theQuery) {"index":{"database":{"error":"","objectName":"","path":"indextest.db"},"name":"","objectName":"","expression":{"0":"title"}},"objectName":"","results":[{"title":"vic"}],"documents":{"0":"vic"},"query":[{"title":"*"}]} It seems the second document simply isn't in the index, so no query will return it. To add the second document to the index we must add all fields of the document to the index expression: U1db.Index { database: theDB id: theIndex expression: ["title", "num"] } And remove the query clause to have the query return all documents in the index: U1db.Query { id: theQuery index: theIndex } So now the output becomes: JSON.stringify(theIndex) {"database":{"error":"","objectName":"","path":"indextest.db"},"name":"","objectName":"","expression":{"0":"title","1":"num"}} JSON.stringify(theQuery) {"index":{"database":{"error":"","objectName":"","path":"indextest.db"},"name":"","objectName":"","expression":{"0":"title","1":"num"}},"objectName":"","results":[{"title":"vic"},{"num":"123"}],"documents":{"0":"vic","1":"xqwzts"}} But now in order to add a query clause all the fields in the index which are also in the document have to be included. U1db.Query { id: theQuery index: theIndex query: [{"title": "*"}] } JSON.stringify(theQuery) {"index":{"database":{"error":"","objectName":"","path":"indextest.db"},"name":"","objectName":"","expression":{"0":"title","1":"num"}},"objectName":"","results":[{"title":"vic"}],"documents":{"0":"vic"},"query":[{"title":"*"}]} In order to actually return all the documents with title=* we have to also specify that num=* U1db.Query { id: theQuery index: theIndex query: [{"title": "*"}, {"num": "*"}] } JSON.stringify(theQuery) {"index":{"database":{"error":"","objectName":"","path":"indextest.db"},"name":"","objectName":"","expression":{"0":"title","1":"num"}},"objectName":"","results":[{"title":"vic"},{"num":"123"}],"documents":{"0":"vic","1":"xqwzts"},"query":[{"title":"*"},{"num":"*"}]} Conclusion: - In order to be included in the index, ALL fields in a document must be included in the index's expression clause. - In order to be returned by a query, ALL fields in a document [which are also in the index] must be included in the query's query clause. This is pretty problematic with large/complicated documents where including every single field in the expression/query clause is not really feasible. To manage notifications about this bug go to: https://bugs.launchpad.net/u1db-qt/+bug/1214538/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
