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Emit ORM-specific database tags #658
Description
#656 added support for adding "db:" tags to generated model structs. The db tag is used by sqlx and gorp. GORM takes a similar approach, but uses the "gorm:" tag.
By design, the emit_db_tags option generates the smallest amount of useful tag information. However, if a user is looking to migrate from gorp / sqlx / GORM, it maybe helpful to generate richer tag information.
For sqlx, I don't think there's anything else the db tag can do. For gorp, this would involve setting attribute like primary key, autoincrement, and size:
type Post struct {
// db tag lets you specify the column name if it differs from the struct field
Id int64 `db:"post_id"`
Created int64
Title string `db:",size:50"` // Column size set to 50
Body string `db:"article_body,size:1024"` // Set both column name and size
}
// Example of using tags to alias fields to column names
// The 'db' value is the column name
//
// A hyphen will cause gorp to skip this field, similar to the
// Go json package.
//
// This is equivalent to using the ColMap methods:
//
// table := dbmap.AddTableWithName(Product{}, "product")
// table.ColMap("Id").Rename("product_id")
// table.ColMap("Price").Rename("unit_price")
// table.ColMap("IgnoreMe").SetTransient(true)
//
// You can optionally declare the field to be a primary key and/or autoincrement
//
type Product struct {
Id int64 `db:"product_id, primarykey, autoincrement"`
Price int64 `db:"unit_price"`
IgnoreMe string `db:"-"`
}GORM has a huge set of options, as the tags are used instead of DDL statements.
There is currently no plan to work on this until we have a specific user that needs this support and is willing to work closely with us on implementation
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