[FEAT] Migration scripts: nodes from Gargantext v2.

gargantext/models/migration.py

+from gargantext.util.db import *
+from gargantext.util.files import upload
+from gargantext.constants import *
+
+from datetime import datetime
+
+from .users import User
+
+
+#__all__ = ['Node', 'NodeType', 'Language']
+
+class NodeType_v2(Base):
+    __table_args__ = {'extend_existing': True}
+    __tablename__  = 'node_nodetype'
+    id             = Column(Integer, primary_key=True)
+    name           = Column(String(255))
+
+class Language_v2(Base):
+    __table_args__ = {'extend_existing': True}
+    __tablename__  = 'node_language'
+    id             = Column(Integer, primary_key=True)
+    iso2           = Column(String(2))
+    iso3           = Column(String(3))
+    fullname       = Column(String(255))
+    implemented    = Column(Boolean)
+
+
+class Node_v2(Base):
+    __table_args__ = {'extend_existing': True}
+    __tablename__  = 'node_node'
+    id             = Column(Integer, primary_key=True)
+    parent_id      = Column(Integer, ForeignKey('node_node.id'))
+    user_id        = Column(Integer, ForeignKey(User.id))
+    type_id        = Column(ForeignKey(NodeType_v2.id))
+    name           = Column(String(255))
+    language_id    = Column(Integer, ForeignKey(Language_v2.id))
+    date           = Column(DateTime(), default=datetime.now)
+    hyperdata      = Column(JSONB, default=dict)
+
+
+def nodes_list(user_id, nodetype, parent_id=None, count=False):
+    """
+    nodes_list :: Int -> String -> Maybe Int -> Maybe Bool -> [(Int, String)]
+    """
+    nodes = ( session.query(Node_v2.id, Node_v2.name)
+                     .join(NodeType_v2, NodeType_v2.id == Node_v2.type_id)
+                     .filter(NodeType_v2.name == nodetype)
+               )
+    if parent_id is not None:
+        nodes = nodes.filter(Node_v2.parent_id == parent_id)
+
+    if count is True:
+        return nodes.count()
+    else:
+        return nodes.all()
+
+def nodes_tree(user_id):
+    """
+    nodes_tree :: Int -> Tree Nodes
+    """
+    for project_id, project_name in nodes_list(user_id, 'Project'):
+        print("* Project (%d, %s)" % (project_id, project_name))
+        for corpus_id, corpus_name in nodes_list(user_id, 'Corpus', parent_id=project_id):
+
+            count =  nodes_list( user_id
+                               , 'Document'
+                               , parent_id=corpus_id
+                               , count=True
+                               )
+
+            if count > 1:
+                print("|- %d %s" % ( corpus_id, corpus_name ))
+                print("  |- %s docs" % count)
+
+