//That's the quick fix, but in fact, you should read about https://stackoverflow.com/questions/44450114/how-to-use-swift-4-codable-in-core-data and avoid Organization1 & Organization
extension Organization {
    static func makeFromOrganization(_ organization: Organization1) -> [Organization] {
        let returnValue = Organization()
        returnValue.address = organization.address
        returnValue.name = organization.name
        ...
        return returnValue
    }
}



func saveOrganizations(_ organizations: [Organization]) -> [Organization] {

    let fails: [Organization] = [] //We return the failed insert in case?
    sharedInstance.database!.open()

    organizations.forEach( { anOrganisation in
        let succeed = sharedInstance.database!.executeUpdate("INSERT INTO Organization (address,Name,...) VALUES ( ?, ?, ?, ?, ?,)",withArgumentsIn: [anOrganisation.name ?? "",anOrganisation.address ?? "",...])
        if succeed == false {
            fails.append(anOrganisation)
        }
    })

    sharedInstance.database!.close()
    return fails
}


do {
    let result = try JSONDecoder().decode(Root.self, from: dataOfAllOrganizations!)
    let organizations = result.organizations.map{ Organization.makeFromOrganization($0) }
    let failed = sharedInstance.saveOrganization_Lists(organizations)
    //What to do if failed is no empty?
} catch {

}