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[Question] many to many relationship in Go Admin #634

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yoavweber opened this issue Aug 7, 2024 · 0 comments
Open

[Question] many to many relationship in Go Admin #634

yoavweber opened this issue Aug 7, 2024 · 0 comments

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@yoavweber
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Description [describe your questions]

I'm trying to set up a many-to-many relationship in Go Admin, specifically between a Guide model and a Region model:

type Region struct {
	gorm.Model
	Name string `gorm:"type:varchar(100)"`
}
type Guide struct {
	gorm.Model
	Name    string   `gorm:"type:varchar(100)"`
	Regions []Region `gorm:"many2many:guide_regions;"`
}

'm having trouble figuring out how to properly handle this relationship in the table setup, particularly for create, update, and delete operations.
My main questions are:

How do I properly save the selected relations when creating or updating a Guide?
How do I ensure that the related records in the junction table (guide_regions) are deleted when a Guide is deleted?

Example code [If you have any code info]

func GetGuidesTable(ctx *context.Context) table.Table {
guides := table.NewDefaultTable(ctx, table.DefaultConfigWithDriver("postgresql"))

info := guides.GetInfo().HideFilterArea()
info.SetTable("guides").SetTitle("Guides").SetDescription("Guides")

info.AddField("ID", "id", db.Int).FieldSortable()
info.AddField("Name", "name", db.Varchar).FieldSortable()
info.AddField("Regions", "regions", db.Varchar).FieldDisplay(func(model types.FieldModel) interface{} {
    return model.Value
})

formList := guides.GetForm()
formList.SetTable("guides").SetTitle("Guides").SetDescription("Guides")

formList.AddField("Name", "name", db.Varchar, form.Text).FieldMust()

formList.AddField("Regions", "regions", db.Varchar, form.Select).
    FieldOptions(getRegionOptions(ctx)).
    FieldDisplay(func(model types.FieldModel) interface{} {
        return model.Value
    }).
    FieldMust()

return guides

}

Thanks!
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@yoavweber