Deletes the edge with the provided edge_id.

Does nothing if the edge does not exist.

iex> e = Edge.new(n1, n2)
iex> Edge.delete(e.id)

Find the edge in the graph that has the provided edge_id.

Returns the edge, or nil if it is not found.

iex> e = Edge.new(n1, n2)
iex> Edge.find(e.id) #=> returns `e`

Adds an edge to the graph connecting node1 and node2.

The edge sets its starting attributes to attrs.

Edges can be created by passing node ids or nodes themselves.

iex> n1 = Node.new
iex> n2 = Node.new
iex> n3 = Node.new
iex> Edge.new(n1.id, n2.id) # or
iex> Edge.new(n2, n3)

Updates the attributes for an edge with the provided edge_id.

If nil is passed as a value in the attrs keyword list, it will remove the key entirely from the edge’s attributes.

iex> e = Edge.new(n1, n2, color: "blue")
iex> Edge.update(e.id, color: nil, label: "Connection")