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listMoviesByRank(DB, L) placeholder needs adjustment in pre.pl of Ex7 #8

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Archer6621 opened this issue Mar 18, 2018 · 0 comments
Open

listMoviesByRank(DB, L) placeholder needs adjustment in pre.pl of Ex7 #8

Archer6621 opened this issue Mar 18, 2018 · 0 comments
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Archer6621 commented Mar 18, 2018 •
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Current:
listMoviesByRank(DB, L) :- DB=placeholder, L=placeholder.

Proposed:
listMoviesByRank(DB, L) :- db(DB), L=placeholder.

This way it might return X=placeholder when queried, which is more in line with the other pre-definitions. db/1 is defined anyway in database.pl of Ex7. At the moment it rather complains about an impossible unification here, while the others don't do this.
@Archer6621 Archer6621 added the bug Something isn't working label Mar 18, 2018
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