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fix: Add /delete bidirectional relations in case of owner #206

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merged 10 commits into from
Oct 5, 2020
Merged

fix: Add /delete bidirectional relations in case of owner #206

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bb47aff
Add /delete bidirectonal relations in case of owner
dikshathakur3119 Sep 28, 2020
56b43c4
Update unit test case
dikshathakur3119 Sep 28, 2020
c0ae7ae
Fix test case
dikshathakur3119 Sep 28, 2020
4f505a6
fix lint
dikshathakur3119 Sep 28, 2020
f709816
Add bidirectional relationships to both follow and read
dikshathakur3119 Sep 30, 2020
3ee0924
fix lint
dikshathakur3119 Sep 30, 2020
b58669f
Add Optional to delete owner query
dikshathakur3119 Sep 30, 2020
34d31a2
Fix lint
dikshathakur3119 Sep 30, 2020
4876ace
fix lint
dikshathakur3119 Sep 30, 2020
1c49649
fix lint
dikshathakur3119 Sep 30, 2020
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24 changes: 14 additions & 10 deletions metadata_service/proxy/neo4j_proxy.py
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Original file line number Diff line number Diff line change
Expand Up @@ -518,7 +518,7 @@ def add_owner(self, *,

upsert_owner_relation_query = textwrap.dedent("""
MATCH (n1:User {key: $user_email}), (n2:Table {key: $tbl_key})
MERGE (n2)-[r2:OWNER]->(n1)
MERGE (n1)-[r1:OWNER_OF]->(n2)-[r2:OWNER]->(n1)
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RETURN n1.key, n2.key
""")

Expand Down Expand Up @@ -546,15 +546,16 @@ def delete_owner(self, *,
owner: str) -> None:
"""
Delete the owner / owned_by relationship.

:param table_uri:
:param owner:
:return:
"""
delete_query = textwrap.dedent("""
MATCH (n1:User{key: $user_email})<-[r1:OWNER]-(n2:Table {key: $tbl_key}) DELETE r1
MATCH (n1:User{key: $user_email}), (n2:Table {key: $tbl_key})
OPTIONAL MATCH (n1)-[r1:OWNER_OF]->(n2)
OPTIONAL MATCH (n2)-[r2:OWNER]->(n1)
DELETE r1,r2
""")

try:
tx = self._driver.session().begin_transaction()
tx.run(delete_query, {'user_email': owner,
Expand Down Expand Up @@ -958,11 +959,14 @@ def _get_user_resource_relationship_clause(relation_type: UserResourceRel, id: s
user_matcher += ' {key: $user_key}'

if relation_type == UserResourceRel.follow:
relation = f'(usr{user_matcher})-[rel:FOLLOW]->(resource{resource_matcher})'
relation = f'(resource{resource_matcher})-[r1:FOLLOWED_BY]->(usr{user_matcher})-[r2:FOLLOW]->' \
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I think those lines should include optional as in the case of deletion. If not then, the existing owners/bookmarks, will not be able to retrieve their existing ones, if they have just one relation and thus it is a breaking change.

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@feng-tao feng-tao Oct 23, 2020 •
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yeah, we should make it optional and delete if so. cc @dikshathakur3119 wdyt?

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Thanks @PaschalisDim for mentioning, this function is used to create query for add, delete and read, I will fix this function to return appropriate match for each of these cases.

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Thanks for taking this over.
@dikshathakur3119
Creation and deletion I guess should be fine. However, when returning what exists, we need to take care to return the ones that were created prior to this MR, so that is the only thing to get altered to include all cases.
Thanks

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No actually, that was reason I made this change at first place. If we do delete with existing query, that is A -Relation1->B-Realtion2->A , it only deletes if there is exact match for bidirectional relation, else it will not make any delete to single relations. And when you use single directional queries to read a relation it will show your deleted tables as well.
Similarly, in case of add, if we add with query A -Relation1->B-Realtion2->A, it will create duplicate relation if there was existing only one way relation. And this will ultimately cause a loop and you will never be able to delete any owner/bookmark which was added from Frontend UI before this MR .

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@PaschalisDim let me know if it makes sense

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Hi @dikshathakur3119
Apologies, I was not clear enough here.
So, before this MR let's assume that there is a user who owns and follows a table (table A).
So he will have one relation (usr{user_matcher})<-[rel:OWNER]-(resource{resource_matcher}) and one relation
(usr{user_matcher})-[rel:FOLLOW]->(resource{resource_matcher}).
Then you make this MR.
After we merge this MR and it goes to production,
when the user will try the tables that he owns, the amundsenmeta library will search for (resource{resource_matcher})-[r1:OWNER]->(usr{user_matcher})-[r2:OWNER_OF]->'
f'(resource{resource_matcher})
these type of matches in order to see whether the user owns any table.
Since before this MR the user just had one-directional, the tableA will not show up in the list of the owned tables.
If he adds himself as an owner to another table, tableB, then he will have applied right the bi-directional and he will just see tableB in the list of owned tables.
To the point, for the existing one-way relations this change is a breaking change.
The add functionality should be fine. The get functionality is in my thoughts not right, since it will get just owners that have assigned themselves as owners just only AFTER this MR was deployed while I am not sure about the delete one which needs to be tested after the GET functionality is fixed.
@dikshathakur3119

f'(resource{resource_matcher})'
elif relation_type == UserResourceRel.own:
relation = f'(usr{user_matcher})<-[rel:OWNER]-(resource{resource_matcher})'
relation = f'(resource{resource_matcher})-[r1:OWNER]->(usr{user_matcher})-[r2:OWNER_OF]->' \
f'(resource{resource_matcher})'
elif relation_type == UserResourceRel.read:
relation = f'(usr{user_matcher})-[rel:READ]->(resource{resource_matcher})'
relation = f'(resource{resource_matcher})-[r1:READ_BY]->(usr{user_matcher})-[r2:READ]->' \
f'(resource{resource_matcher})'
else:
raise NotImplementedError(f'The relation type {relation_type} is not defined!')
return relation
Expand Down Expand Up @@ -1160,9 +1164,9 @@ def delete_resource_relation_by_user(self, *,
)

delete_query = textwrap.dedent("""
MATCH {rel_clause}
DELETE rel
""".format(rel_clause=rel_clause))
MATCH {rel_clause}
DELETE r1, r2
""".format(rel_clause=rel_clause))

try:
tx = self._driver.session().begin_transaction()
Expand Down
12 changes: 8 additions & 4 deletions tests/unit/proxy/test_neo4j_proxy.py
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Original file line number Diff line number Diff line change
Expand Up @@ -963,28 +963,32 @@ def test_user_resource_relation_clause(self) -> None:
id='foo',
user_key='bar',
resource_type=ResourceType.Table)
expected = '(usr:User {key: $user_key})-[rel:FOLLOW]->(resource:Table {key: $resource_key})'
expected = '(resource:Table {key: $resource_key})-[r1:FOLLOWED_BY]->(usr:User {key: $user_key})-' \
'[r2:FOLLOW]->(resource:Table {key: $resource_key})'
self.assertEqual(expected, actual)

actual = neo4j_proxy._get_user_resource_relationship_clause(UserResourceRel.read,
id='foo',
user_key='bar',
resource_type=ResourceType.Table)
expected = '(usr:User {key: $user_key})-[rel:READ]->(resource:Table {key: $resource_key})'
expected = '(resource:Table {key: $resource_key})-[r1:READ_BY]->(usr:User {key: $user_key})-[r2:READ]->' \
'(resource:Table {key: $resource_key})'
self.assertEqual(expected, actual)

actual = neo4j_proxy._get_user_resource_relationship_clause(UserResourceRel.own,
id='foo',
user_key='bar',
resource_type=ResourceType.Table)
expected = '(usr:User {key: $user_key})<-[rel:OWNER]-(resource:Table {key: $resource_key})'
expected = '(resource:Table {key: $resource_key})-[r1:OWNER]->(usr:User {key: $user_key})-[r2:OWNER_OF]->' \
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@verdan
We need something similar (and precise as well) for atlas as well, what do you think?

'(resource:Table {key: $resource_key})'
self.assertEqual(expected, actual)

actual = neo4j_proxy._get_user_resource_relationship_clause(UserResourceRel.follow,
id='foo',
user_key='bar',
resource_type=ResourceType.Dashboard)
expected = '(usr:User {key: $user_key})-[rel:FOLLOW]->(resource:Dashboard {key: $resource_key})'
expected = '(resource:Dashboard {key: $resource_key})-[r1:FOLLOWED_BY]->(usr:User {key: $user_key})-' \
'[r2:FOLLOW]->(resource:Dashboard {key: $resource_key})'
self.assertEqual(expected, actual)


Expand Down