Overriding types when directory name doesn't match package name

[torrayne]

When overriding a type, the name is just generated from the import path. So if the directory doesn't match the package name you will get invalid types.

Example: https://github.com/guregu/null

overrides: 
  - db_type: "varchar"
    go_type: "gopkg.in/guregu/null.v4.String"
    nullable: true

Will produce:

type Click struct {
  ID int `json:"id"`
  Code null.v4.String `json:"code"`
  DiscountCode null.v4.String `json:"discount_code"`
  Mode null.v4.String `json:"mode"`
  Language null.v4.String `json:"language"`
  Link string `json:"link"`
  Ip null.v4.String `json:"ip"`
  InsertedAt time.Time `json:"inserted_at"`
}

The package is null not null.v4. Expected null.String got null.v4.String.

Maybe something like go_package_name could be added?

In the meantime, if anyone needs JSON friendly null, you can use github.com/emvi/null

With these overrides

overrides:
  - db_type: "varchar"
    go_type: "github.com/emvi/null.String"
    nullable: true
  - db_type: "text"
    go_type: "github.com/emvi/null.String"
    nullable: true
  - db_type: "char"
    go_type: "github.com/emvi/null.String"
    nullable: true
  - db_type: "tinytext"
    go_type: "github.com/emvi/null.String"
    nullable: true
  - db_type: "mediumtext"
    go_type: "github.com/emvi/null.String"
    nullable: true
  - db_type: "longtext"
    go_type: "github.com/emvi/null.String"
    nullable: true
  - db_type: "int"
    go_type: "github.com/emvi/null.Int64"
    nullable: true
  - db_type: "integer"
    go_type: "github.com/emvi/null.Int64"
    nullable: true
  - db_type: "smallint"
    go_type: "github.com/emvi/null.Int64"
    nullable: true
  - db_type: "mediumint"
    go_type: "github.com/emvi/null.Int64"
    nullable: true
  - db_type: "bigint"
    go_type: "github.com/emvi/null.Int64"
    nullable: true
  - db_type: "year"
    go_type: "github.com/emvi/null.Int64"
    nullable: true
  - db_type: "date"
    go_type: "github.com/emvi/null.Time"
    nullable: true
  - db_type: "timestamp"
    go_type: "github.com/emvi/null.Time"
    nullable: true
  - db_type: "datetime"
    go_type: "github.com/emvi/null.Time"
    nullable: true
  - db_type: "time"
    go_type: "github.com/emvi/null.Time"
    nullable: true

[torrayne]

Closed as duplicate of #463