feat(taxref): add cd_ref path (ltree) mat. view

apptax/migrations/versions/83d7105edb76_taxref_tree.py

@@ -0,0 +1,61 @@
+"""create vm_taxref_tree
+
+Revision ID: 83d7105edb76
+Revises: 44447746cacc
+Create Date: 2024-10-05 17:40:11.302423
+
+"""
+
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = "83d7105edb76"
+down_revision = "6a20cd1055ec"
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    op.execute("CREATE EXTENSION IF NOT EXISTS ltree")
+    op.execute(
+        """
+        CREATE MATERIALIZED VIEW taxonomie.vm_taxref_tree
+        AS WITH RECURSIVE x AS (
+                SELECT t.cd_nom as cd_ref,
+                    t.cd_nom::text::ltree AS path
+                FROM taxonomie.taxref t
+                WHERE t.cd_sup IS NULL AND t.cd_nom = t.cd_ref
+                UNION ALL
+                SELECT y.cd_nom AS cd_ref,
+                    ltree_addtext(x_1.path, y.cd_nom::text) AS path
+                FROM x x_1,
+                    taxonomie.taxref y
+                WHERE y.cd_nom = y.cd_ref AND x_1.cd_ref = y.cd_sup
+                )
+        SELECT x.cd_ref,
+            x.path
+        FROM x
+        WITH DATA
+        """
+    )
+    op.create_index(
+        index_name="taxref_tree_cd_nom_idx",
+        schema="taxonomie",
+        table_name="vm_taxref_tree",
+        columns=["cd_ref"],
+        unique=True,
+    )
+    # required for these operators: <, <=, =, >=, >, @>, <@, @, ~, ?
+    op.create_index(
+        index_name="taxref_tree_path_idx",
+        schema="taxonomie",
+        table_name="vm_taxref_tree",
+        columns=["path"],
+        postgresql_using="gist",
+    )
+
+
+def downgrade():
+    op.execute("DROP MATERIALIZED VIEW taxonomie.vm_taxref_tree")

apptax/taxonomie/models.py

@@ -3,7 +3,7 @@
 
 from sqlalchemy.ext.hybrid import hybrid_property
 from sqlalchemy.schema import FetchedValue
-from sqlalchemy.orm import deferred, raiseload, joinedload, foreign, remote
+from sqlalchemy.orm import backref, deferred, raiseload, joinedload, foreign, remote
 
 from utils_flask_sqla.serializers import serializable
 from ref_geo.models import LAreas
@@ -539,6 +539,14 @@ class TMetaTaxref(db.Model):
     update_date = db.Column(db.DateTime, default=db.func.now(), nullable=False)
 
 
+class TaxrefTree(db.Model):
+    __tablename__ = "vm_taxref_tree"
+    __table_args__ = {"schema": "taxonomie"}
+    cd_ref = db.Column(db.Integer, ForeignKey("taxonomie.taxref.cd_ref"), primary_key=True)
+    taxref = db.relationship(Taxref, backref=backref("tree", uselist=False))
+    path = db.Column(db.String, nullable=False)
+
+
 # Taxref deffered properties
 
 Taxref.nb_medias = deferred(