Trying the first example in the readme file after successfully installing the pack:</p

Readme example not working about terminus_store_prolog HOT 4 CLOSED

pmoura commented on July 20, 2024

Readme example not working

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Comments (4)

matko commented on July 20, 2024 1

That's embarassing. The instructions are wrong.

When a named graph doesn't exist yet, you need to do create_named_graph/3 rather than open_named_graph/3. I'll update the readme.

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matko commented on July 20, 2024

open_directory_store won't create the directory, so if it doesn't exist, it'll throw that exception.

Try to create an empty directory, then opening that as a store. Does that work?

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pmoura commented on July 20, 2024

That was my first guess. I tried it moments ago but got a failure:

$ mkdir testdir

Then:

?- use_module(library(terminus_store)).                                                                                                                                          true.

?- open_directory_store("testdir", Store), open_write(Store, Builder), open_named_graph(Store, "sometestdb", DB), nb_add_triple(Builder, "Subject", "Predicate", value("Object")), nb_commit(Builder, Layer), nb_set_head(DB, Layer).
false.

?- trace.
true.

[trace]  ?- open_directory_store("testdir", Store), open_write(Store, Builder), open_named_graph(Store, "sometestdb", DB), nb_add_triple(Builder, "Subject", "Predicate", value("Object")), nb_commit(Builder, Layer), nb_set_head(DB, Layer).
   Call: (11) terminus_store:open_directory_store("testdir", _5708) ? creep
   Exit: (11) terminus_store:open_directory_store("testdir", <store_blob>) ? creep
   Call: (11) terminus_store:open_write(<store_blob>, _5714) ? creep
   Exit: (11) terminus_store:open_write(<store_blob>, <layer_builder>) ? creep
   Call: (11) terminus_store:open_named_graph(<store_blob>, "sometestdb", _5730) ? creep
   Fail: (11) terminus_store:open_named_graph(<store_blob>, "sometestdb", _5730) ? creep
false.