[FEATURE] REST json_node_link for explorer: ok for simple test (need to add parameters but easy).

WorkFlow2.ipynb

 {
  "metadata": {
   "name": "",
-  "signature": "sha256:36d4a29aece1cb338b47c8a110423fdbe185517347ed2d43a0d21ce31599a549"
+  "signature": "sha256:bf10746bfd6c692f30c86ce04981cf9327380ae3f73174ac91c2acc8e885880a"
  },
  "nbformat": 3,
  "nbformat_minor": 0,
@@ -1176,6 +1176,26 @@
      "outputs": [],
      "prompt_number": 145
     },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "cooc.pk"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "metadata": {},
+       "output_type": "pyout",
+       "prompt_number": 163,
+       "text": [
+        "61311"
+       ]
+      }
+     ],
+     "prompt_number": 163
+    },
     {
      "cell_type": "code",
      "collapsed": false,

gargantext_web/urls.py

@@ -35,7 +35,7 @@ urlpatterns = patterns('',
     url(r'^exploration$', views.exploration),
 
     url(r'^chart/corpus/(\d+)/data.csv$', views.send_csv),
-    url(r'^graph.json$', views.send_graph),
+    url(r'^graph.json$', views.json_node_link),
 
     url(r'^api/corpus/(\d+)/ngrams$', gargantext_web.api.CorpusController.ngrams),
     url(r'^api/corpus/(\d+)/metadata$', gargantext_web.api.CorpusController.metadata),

gargantext_web/views.py

@@ -8,7 +8,7 @@ from django.template import Context
 #from documents.models import Project, Corpus, Document
 
 from node.models import Language, ResourceType, Resource
-from node.models import Node, NodeType, Node_Resource, Project, Corpus
+from node.models import Node, NodeType, Node_Resource, Project, Corpus, NodeNgramNgram
 from node.admin import CorpusForm, ProjectForm, ResourceForm
 
 from django.contrib.auth.models import User
@@ -414,20 +414,45 @@ def send_csv(request, corpus_id):
 
     return response
 
-def send_graph(request):
+def json_node_link(request):
     '''
     Create the HttpResponse object with the graph dataset.
     '''
     response = HttpResponse(content_type='text/json')
     response['Content-Disposition'] = 'attachment; filename="graph.json"'
 
-    writer = csv.writer(response)
+#    writer = csv.writer(response)
+#
+#    file = open('/srv/gargantext/tests/graphsam/randomgraphgen.json', 'r')
+#    for line in file.readlines():
+#        writer.writerow(line)
 
-    file = open('/srv/gargantext/tests/graphsam/randomgraphgen.json', 'r')
-    for line in file.readlines():
-        writer.writerow(line)
 
-    return response
+    matrix = defaultdict(lambda : defaultdict(float))
+    
+    cooc = Node.objects.get(id=61311)
+
+    for cooccurrence in NodeNgramNgram.objects.filter(node=cooc):
+        matrix[cooccurrence.ngramx.terms][cooccurrence.ngramy.terms] = cooccurrence.score
+        matrix[cooccurrence.ngramy.terms][cooccurrence.ngramx.terms] = cooccurrence.score
+    import pandas as pd
+    from copy import copy
+    import numpy as np
+    import networkx as nx
+
+    from gargantext_web.api import JsonHttpResponse
+    #from analysis.louvain import *
+    df = pd.DataFrame(matrix).T.fillna(0)
+    x = copy(df.values)
+    x = x / x.sum(axis=1)
+
+    matrix_filtered = np.where(x > .2, 1, 0)
+    G = nx.from_numpy_matrix(matrix_filtered)
+    G = nx.relabel_nodes(G, dict(enumerate(df.columns)))
+    from networkx.readwrite import json_graph
+    data = json_graph.node_link_data(G)
+    return JsonHttpResponse(data)
+
 
 
 def graph_it(request):
@@ -439,4 +464,4 @@ def graph_it(request):
         'user': user,
         'date': date,
     }))    
-    return HttpResponse(html)
+    return HttpResponse(html)
\ No newline at end of file