I have implemented the logic to show Dependencies/Dependents when user click on browser nodes. Attached is the patch file, please review it and if it looks good then please commit it.
I have also added this support in "Database" , "Tablespace" and "Role" as this nodes are already been committed. Following is the information about how to add the support in other nodes
It seems to me that this patch is implemented in a way to violates modularity - specifically, it adds smarts about a child node into the code for a parent node, rather than leaving each node to be self-contained. For example, web/pgadmin/browser/server_groups/servers/depends.py contains the SQL and other logic for displaying the dependencies and dependents of tablespace and role nodes.
I would expect to see role-specific code confined to the roles module, database-specific confined to the database module and so on.
As a side-note - shouldn't the code also use SQL templates for the SQL, rather than hard-coding it into Python? I would expect to see it using the same versioning mechanism we use elsewhere, to make it a simple matter of adding a new template to update to support a new version of Postgres.
