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docs: Add v0 import example to v0-compatibility #8

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Dec 18, 2024
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docs: Add v0 import example to v0-compatibility #8

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42 changes: 42 additions & 0 deletions docs/content/v0-compatibility.md
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Original file line number Diff line number Diff line change
Expand Up @@ -111,6 +111,48 @@ r := rego.New(
)
```

Finally, another option is to import the `v0` package instead. The program

below imports the v0 package instead:

```go
package main

import (
"context"
"encoding/json"
"fmt"

"github.com/open-policy-agent/opa/rego"
// rather than the v1 import, which is:
// "github.com/open-policy-agent/opa/v1/rego"
)

func main() {
module := `package example
messages[msg] {
msg := "foo"
}
`

r := v0rego.New(
rego.Query("data.example.messages"),
rego.Module("example.rego", module),
)

rs, _ = rv0.Eval(context.TODO())
bs, _ = json.Marshal(rs)

fmt.Println(string(bs))
}
```

{{< danger >}}
**Note**: Using v0 packages and v1 packages in the same program is considered an
anti-pattern and is not recommended or supported. Any interoperability between
the two packages is not guaranteed and should be considered unsupported.
{{< /danger >}}

### v0.x compatibility mode in the OPA Go SDK

{{< info >}}
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