Check failure with dev version of dbplyr

[hadley]

Running examples in ‘metagenomeFeatures-Ex.R’ failed
The error most likely occurred in:

> ### Name: MgDb-class
> ### Title: Metagenome Database class
> ### Aliases: MgDb-class mgdb
> 
> ### ** Examples
> 
> # example MgDb-class object, Greengenes 13.8 85% OTUs database.
> gg85 <- get_gg13.8_85MgDb()
Error in validObject(.Object) : 
  invalid class “MgDb” object: 1: invalid object for slot "taxa" in class "MgDb": got class "tbl_SQLiteConnection", should be or extend class "tbl_dbi"
invalid class “MgDb” object: 2: invalid object for slot "taxa" in class "MgDb": got class "tbl_dbi", should be or extend class "tbl_dbi"
invalid class “MgDb” object: 3: invalid object for slot "taxa" in class "MgDb": got class "tbl_sql", should be or extend class "tbl_dbi"
invalid class “MgDb” object: 4: invalid object for slot "taxa" in class "MgDb": got class "tbl_lazy", should be or extend class "tbl_dbi"
invalid class “MgDb” object: 5: invalid object for slot "taxa" in class "MgDb": got class "tbl", should be or extend class "tbl_dbi"
Calls: get_gg13.8_85MgDb ... newMgDb -> new -> initialize -> initialize -> validObject
Execution halted

Presumably because I tweaked the class structure slightly