35 lines
1.0 KiB
Go
35 lines
1.0 KiB
Go
package helper
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import (
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"encoding/json"
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"fmt"
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jsonpatch "github.com/evanphx/json-patch/v5"
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)
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// GenMergePatch will return a merge patch document capable of converting the
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// original object to the modified object.
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// The merge patch format is primarily intended for use with the HTTP PATCH method
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// as a means of describing a set of modifications to a target resource's content.
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func GenMergePatch(originalObj interface{}, modifiedObj interface{}) ([]byte, error) {
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originalBytes, err := json.Marshal(originalObj)
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if err != nil {
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return nil, fmt.Errorf("failed to marshal original object: %w", err)
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}
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modifiedBytes, err := json.Marshal(modifiedObj)
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if err != nil {
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return nil, fmt.Errorf("failed to marshal modified object: %w", err)
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}
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patchBytes, err := jsonpatch.CreateMergePatch(originalBytes, modifiedBytes)
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if err != nil {
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return nil, fmt.Errorf("failed to create a merge patch: %w", err)
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}
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// It's unnecessary to patch.
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if string(patchBytes) == "{}" {
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return nil, nil
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}
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return patchBytes, nil
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}
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