Recognises a polymorphic association
https://knobit.org/id/knobit/K-522
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| Context functions | Result evaluation |
|---|---|
| Knobit creation methods | AI generated, human edited |
| Knobit types | Skill |
| LCG purposes | Assessing the learner's knowledge or skill state |
| LCG purposes | Selecting an assessment task or learning activity |
| action verb | Recognises en |
| applies knowledge | Explains attribute domains |
| applies knowledge | Explains relationship cardinality and optionality |
| assessment criterion | Flags the deficient case and passes the acceptable one. Deficient: Case Note with Owner Id and Owner Type (`ACCOUNT`, `PAYMENT`, `PARTY`) Acceptable: One relationship per parent (Case Note → Account, Case Note → Payment), each with its rule, plus a rule that exactly one is set; or a supertype the parents share, only if they pass row 27's test (`LOG-012` when Owner Id has the `foreign-key` role; review only otherwise) en |
| assessment method | skill-tests task: Loan application logical model (normalisation anomaly skills) en |
| conforms to profile | https://oppekava.edu.ee/a/Knobitite_kirjeldamise_ja_seostamise_reeglid#LCG-KNOBIT-0.1 |
| dcterms:identifier | K-522 |
| dcterms:license | https://creativecommons.org/licenses/by/4.0/ |
| dcterms:source | Review checklist 03-logical, row 22; Karwin, Polymorphic Associations; E&N ch. 4 (union types) en |
| expected result | The reference attribute, its type attribute and the entities it points to en |
| owl:sameAs | https://bitbucket.org/reffa/ontology/id/knobit/data-modelling/05-logical/22 |
| rdfs:label | Recognises a polymorphic association en |
| schema:creativeWorkStatus | accepted |
| schema:isPartOf | Data modelling (DAMA-DMBOK2) |
| skos:altLabel | Polymorphic association (logical model) en |
| skos:definition | One reference attribute pointing to different entities depending on the value of a type attribute. There is no single parent, so the relationship has no cardinality, no optionality and no rule, and the physical model cannot declare a foreign key. A specific form of row 6. en |
| skos:prefLabel | Recognises a polymorphic association en |
| target object | polymorphic association en |
Used by
| includes knobit | Derives a normalised logical data model and traces anomalies to their causes |
|---|---|
| requires knobit | Derive the logical data model |