Remember a pit for gorm initialization

When initializing gorm across files, if db is used in gorm.open after db *gorm.DB is declared in advance, and err:= gorm.open, an error will be reported later
The error code is:
panic: runtime error: invalid memory address or nil pointer dereference

change db,err:=gorm.open to
var err error
db,err=gorm.open
error resolved

The solution comes from blog:
http://t.csdn.cn/IxS0o