Sqlite.swift no such table error - sqlite

Question

I have created a function for mapping json data to a sqlite store using sqlite.swift. I am receiving strange behavior though since the first time I try to run an insert I get a "No such table" error". But the inserts work perfectly after that initial throw. My code works by making a connection to the database onload using SQLData.instance.connect(). Then every time a call to insert is placed it initializes the table to make sure it is set up with all the columns within the data.
//attached to button
let userJSON = JSON(["user_id" : id, "username" : email])
SQLData.instance.insert(table: "users", data: userJSON) { result in
if let result = result{
print(result)
}
}
//sql class
class SQLData {
static let instance = SQLData()
var db: Connection? = nil
func connect() {
let path = NSSearchPathForDirectoriesInDomains(
.documentDirectory, .userDomainMask, true
).first!
do {
self.db = try Connection("\(path)/contacts.sqlite3")
if let db = self.db {
try db.run(Table("users").drop(ifExists: true))
}
print("SQLite connection established.")
} catch {
print("Couldn't create SQLite connection.")
}
}
func initTable(table: String, data: JSON, completionHandler: (Table?) -> Void){
if let db = db {
let t = Table(table)
do {
try db.run(t.create(temporary: false, ifNotExists: true) { r in
r.column(Expression<Int>("id"), primaryKey: true)
r.column(Expression<Bool>("synced"), defaultValue: false)
for (key,val) in data {
if val.bool != nil{
r.column(Expression<Bool>(key), defaultValue: false)
} else if val.int != nil {
r.column(Expression<Int>(key), defaultValue: 0)
} else if val.double != nil {
r.column(Expression<Double>(key), defaultValue: 0.0)
} else {
r.column(Expression<String?>(key), defaultValue: "")
}
}
completionHandler(t)
})
} catch let err {
print(err)
completionHandler(nil)
}
} else {
completionHandler(nil)
}
}
func insert(table: String, data: JSON, completionHandler: #escaping (Int64?) -> Void){
self.initTable(table: table, data: data) { t in
if let db = db, let t = t {
var query: [Setter] = []
for (key, val) in data {
if val.bool != nil{
query.append(Expression<Bool>(key) <- val.boolValue)
} else if val.int != nil {
query.append(Expression<Int>(key) <- val.intValue)
} else if val.double != nil {
query.append(Expression<Double>(key) <- val.doubleValue)
} else {
query.append(Expression<String?>(key) <- val.stringValue)
}
}
do {
try db.transaction {
let insert = t.insert(query)
let rowid = try db.run(insert)
completionHandler(rowid)
}
} catch let err {
print(err)
completionHandler(nil)
}
} else {
completionHandler(nil)
}
}
}
}

Answer 1

Change your connection function as below
func connect(){
do {
let databaseFilePath = Bundle.main.path(forResource: "contacts", ofType: "sqlite3")!
db = try Connection(databaseFilePath)
} catch {
print(error)
}
}
and bu sure your .sqlite3 (or .db) file in to your project hierarchy and copy bundle resources like images