Comments (4)
In your case, these settings will be extra, try to remove them:
from sqlalchemy_mptt import tree_manager ... tree_manager.register_events()
It worked somehow, but it means that the tree is reconstructed after every insert, isn't it?
Also, I did not find much in documentation about path_to_root() method. When i'm trying to get a dict with path from some node to root, it gives me an SQL code instead of executing it and returning a dict:
for mt in models.MyModelTree.query.all():
if mt.parent_id:
breadcrumbs = mt.path_to_root()
print str(breadcrumbs)
SELECT * FROM my_model_tree
WHERE my_model_tree.tree_id = :tree_id_1 AND
my_model_tree.lft <= :lft_1 AND
my_model_tree.rgt >= :rgt_1
ORDER BY my_model_tree.tree_id DESC,
my_model_tree.level DESC,
my_model_tree.lft DESC
...
from sqlalchemy_mptt.
Well, when you add any data to the database, he tries to be counted lft
, rgt
and level
attribute. This is done very quickly if the tree already exists in the database, but it is absolutely not allowed for initialize the tree, it is very long. In your case, you can change the code like this:
from sqlalchemy_mptt import tree_manager
...
tree_manager.register_events(remove=True) # Disable events
for event, element in etree.iterparse(filepath, tag="XML_ObjectFields"):
item = models.MyModelTree()
item.code = element.find('code').text
item.name = element.find('name').text
if element.find('code_parent') is not None:
item.code_parent = element.find('code_parent').text
parent = models.MyModelTree.query.filter_by(code=element.find('code_parent').text).first()
if parent:
item.parent_id = parent.id
db.session.add(item)
element.clear()
db.session.commit()
...
tree_manager.register_events() # enabled events back
models.MyModelTree.rebuild_tree(db.session, models.MyModelTree.tree_id) # rebuild lft, rgt value automatically
Also see tests for example https://github.com/uralbash/sqlalchemy_mptt/blob/master/sqlalchemy_mptt/tests/test_events.py#L57-L90
Also, I did not find much in documentation about path_to_root() method. When i'm trying to get a dict with path from some node to root, it gives me an SQL code instead of executing it and returning a dict:
Most methods return Query object, like this https://github.com/uralbash/sqlalchemy_mptt/blob/master/sqlalchemy_mptt/mixins.py#L208
Therefore, simply complete the construction of the query, like .all()
method:
for mt in models.MyModelTree.query.all():
if mt.parent_id:
breadcrumbs = mt.path_to_root()
print str(breadcrumbs.all())
Documentation that is not good enough. I will be glad to any contribute there.
from sqlalchemy_mptt.
@T0SH1R0 Please tell me if this solve your problem?
from sqlalchemy_mptt.
I added the documentation here http://sqlalchemy-mptt.readthedocs.io/initialize.html#filling-data-at-the-first-time
from sqlalchemy_mptt.
Related Issues (20)
- better initialization of empty tree
- Add a method get_drilldown_branches
- Incompatibility with Django MPTT: level value for root node HOT 4
- IntegrityError on attempt to initalize the tree HOT 9
- Compatibility with joined-table inheritance HOT 3
- Feature Request: Implement Child and sibling methods HOT 5
- linear structure HOT 2
- How to apply soft-delete for a node deletion?
- move_after moves node too far right HOT 1
- Moving node to leftmost position doesn't work HOT 4
- Dynamic query HOT 8
- Updating nodes without an existing parent does not work
- null value in column \"lft\" violates not-null constraint
- drilldown_tree as a list
- drilldown_tree as a list HOT 1
- Support mptt_sessionmaker with async session HOT 3
- The problem with duplicate nodes in same tree
- A problem when I insert the root HOT 7
- rebuild_tree performance issue - Takes too much time
- New release?
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from sqlalchemy_mptt.