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feat: add AddReference method to References #415

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feat: add AddReference method to References #415

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16 changes: 16 additions & 0 deletions pkg/config/resource.go
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Original file line number Diff line number Diff line change
Expand Up @@ -165,10 +165,26 @@ type ExternalName struct {
IdentifierFields []string
}

var ErrReferenceAlreadyExists = errors.New("reference for field already exists")

// References represents reference resolver configurations for the fields of a
// given resource. Key should be the field path of the field to be referenced.
type References map[string]Reference

// AddReference adds a reference configuration for the given field path.
// The fieldPath is the Terraform field path of the field to be referenced.
//
// Example: "vpc_id" or "forwarding_rule.certificate_name" in case of nested
// in another object.
func (r References) AddReference(fieldPath string, ref Reference) error {
if _, ok := r[fieldPath]; ok {
return ErrReferenceAlreadyExists
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I don't love returning an error in this situation. My instinct is that the action of setting a reference should be idempotent; as you've implemented it all times it's invoked but the first will fail with an error.

Maybe it's ok because it would happen at generation time, although I don't know if we could guarantee that.

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I have no strong opinions; either way it is fine by me

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Hey @mbbush, what would be the resolution here? I am not sure if you requested some changes or not

}

r[fieldPath] = ref
return nil
}

// Reference represents the Crossplane options used to generate
// reference resolvers for fields
type Reference struct {
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31 changes: 31 additions & 0 deletions pkg/config/resource_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -112,3 +112,34 @@ func TestSetExternalTagsWithPaved(t *testing.T) {
})
}
}

func TestReferences_AddReference(t *testing.T) {
t.Run("Adding a reference", func(t *testing.T) {
r := &Resource{References: References{}}
err := r.References.AddReference("forwarding_rule.certificate_name", Reference{
TerraformName: "digitalocean_certificate",
})
if err != nil {
t.Fatalf("AddReference() got error: %v", err)
}
if len(r.References) != 1 {
t.Fatalf("AddReference() got error: %v", err)
}
})
t.Run("Adding twice a reference for a given field", func(t *testing.T) {
r := &Resource{References: References{}}
err := r.References.AddReference("forwarding_rule.certificate_name", Reference{
TerraformName: "digitalocean_certificate",
})
if err != nil {
t.Fatalf("AddReference() got error: %v", err)
}

err = r.References.AddReference("forwarding_rule.certificate_name", Reference{
TerraformName: "digitalocean_certificate",
})
if !errors.Is(err, ErrReferenceAlreadyExists) {
t.Fatalf("AddReference() should have returned an error")
}
})
}
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