generated from alecodes/base-template
50 lines
1.9 KiB
Go
50 lines
1.9 KiB
Go
package synchronizator
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// A user representation of a relationship, this interface should be implemented by the user
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// to provide the ability to parse the database relationship into a user defined
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// struct that fulfills it's requirements.
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//
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// Example usage:
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//
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// type collection_relation struct{}
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//
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// func (collection *collection_relation) ToRelationship() (string, []byte, error) {
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// return "COLLECTION_HAS", nil, nil
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// }
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//
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// func (collection *collection_relation) FromRelationship(_class string, metadata []byte) error {
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// if _class != "COLLECTION_HAS" {
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// return fmt.Errorf("invalid class %s", _class)
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// }
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// return nil
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// }
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type RelationshipClass interface {
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// How to transform the struct into a collection. It needs to return the class,
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// and a []byte representation of the metadata.
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//
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// - class: Is used for classification and query pourposes. It's recomended to provide a constante string to increase consistency.
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// - metadata: Arbitrary data. This will be stored as a jsonb in the database
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//
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ToRelationship() (string, []byte, error)
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// How to transform a relationship into the struct. This method should modify the
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// struct directly as it receives a pointer.
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//
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// - class: Is used for classification and query pourposes.
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// - metadata: Arbitrary data. This is stored as a jsonb in the database
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FromRelationship(string, []byte) error
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}
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// A relationship in the database.
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// It adds some helper methods to easily manage the node.
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type Relationship struct {
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_conn *DB // Underlaying connection to the database.
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_class string // The class of the node, should not be modified to avoid inconsistencies.
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From int64 // From what node this relation comes from
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To int64 // To what node this relation goes to
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Metadata []byte // Arbitrary data. This is stored as a jsonb in the database
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}
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func (relationship *Relationship) GetClass() string {
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return relationship._class
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}
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