IT:ArangoDB:HowTo:API/JS/Graphs/Paths [Notes]

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# IT:ArangoDB:HowTo:API/JS/Graphs/Paths #



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<panel title="Summary">

We already touched on the very simple edge collection specific methods:

* [[IT/AD/ArangoDB/HowTo/API/JS/Graphs/Edges]]

As well as stating that the PATH method offers a lot more options.


</panel>


## Process ##


### Searching for Direct Relationships (Path Length of 1)

<sxh javascript>
//Create a Statement to search for Paths
//that have a Start/Source of X,
//and a length of 1 (ie, direct friends of X)
//and return just the name 
stmt = db._createStatement(
  {
   "query" : "FOR p IN PATHS(users, knows,'outbound')
              FILTER p.source._id == @id 
                     && 
                     LENGTH(p.edges) == 1
              RETURN p.vertices[*].name"
  });

stmt.bind("id", carla._id);
cursor = stmt.execute();

while (cursor.hasNext()) {
  print(cursor.next());
}
</sxh>


### Searching for Friends of Friends (Path Length of 2)

<sxh javascript>
//create a statement for
//Paths with a start/source of X
//and length larger than 1 (ie not direct friends)
//and return just the name.
stmt = db._createStatement(
    { 
    "query" : "FOR p IN PATHS(users, knows, 'outbound') 
               FILTER p.source._id == @id 
                      && LENGTH(p.edges) 2 
               RETURN p.vertices[*].name" 
    });

stmt.bind("id", carla._id);
cursor = stmt.execute();

while (cursor.hasNext()) {
  print(cursor.next());
}

</sxh>


### Searching for all InDirect Relationships (Path Length of >1)

<sxh javascript>
//create a statement for
//Paths with a start/source of X
//and length larger than 1 (ie not direct friends)
//and return just the name.
stmt = db._createStatement(
    { 
    "query" : "FOR p IN PATHS(users, edges, 'outbound') 
               FILTER p.source._id == @id 
                      && LENGTH(p.edges) > 1 
                      && LENGTH(p.edges) < 7 
               RETURN p.vertices[*].name" 
    });

stmt.bind("id", carla._id);
cursor = stmt.execute();

while (cursor.hasNext()) {
  print(cursor.next());
}

</sxh>



#### Who knows X 

<sxh javascript>
//Changing 'outbound' to 'inbound' 
//create a statement for Paths
//with source/start of X, and length 1
//returning the terminal vertex (the second vertex...)

stmt = db._createStatement(
         { "query" : "FOR p IN PATHS(users, knows, 'inbound') 
                      FILTER p.source._id == @id 
                             && LENGTH(p.edges) == 1 
                      RETURN p.vertices[1].name" });
stmt.bind("id", carla._id);
cursor = stmt.execute();
while (cursor.hasNext()) {
  print(cursor.next());
}
</sxh>



## Resources ##

* https://www.arangodb.org/2013/01/31/querying-documents-and-graphs-in-one-database-with-aql-easily