- %help : overall help message

- %help db : db method help message
* help message referred by mongodb shell help message.

helps.py

@@ -0,0 +1,46 @@
+DB_METHODS = """
+    db.addUser(userDocument)
+    db.adminCommand(nameOrDocument) - switches to 'admin' db, and runs command [ just calls db.runCommand(...) ]
+    db.auth(username, password)
+    db.cloneDatabase(fromhost)
+    db.commandHelp(name) returns the help for the command
+    db.copyDatabase(fromdb, todb, fromhost)
+    db.createCollection(name, { size : ..., capped : ..., max : ... } )
+    db.currentOp() displays currently executing operations in the db
+    db.dropDatabase()
+    db.eval(func, args) run code server-side
+    db.fsyncLock() flush data to disk and lock server for backups
+    db.fsyncUnlock() unlocks server following a db.fsyncLock()
+    db.getCollection(cname) same as db['cname'] or db.cname
+    db.getCollectionNames()
+    db.getLastError() - just returns the err msg string
+    db.getLastErrorObj() - return full status object
+    db.getMongo() get the server connection object
+    db.getMongo().setSlaveOk() allow queries on a replication slave server
+    db.getName()
+    db.getPrevError()
+    db.getProfilingLevel() - deprecated
+    db.getProfilingStatus() - returns if profiling is on and slow threshold
+    db.getReplicationInfo()
+    db.getSiblingDB(name) get the db at the same server as this one
+    db.hostInfo() get details about the server's host
+    db.isMaster() check replica primary status
+    db.killOp(opid) kills the current operation in the db
+    db.listCommands() lists all the db commands
+    db.loadServerScripts() loads all the scripts in db.system.js
+    db.logout()
+    db.printCollectionStats()
+    db.printReplicationInfo()
+    db.printShardingStatus()
+    db.printSlaveReplicationInfo()
+    db.removeUser(username)
+    db.repairDatabase()
+    db.resetError()
+    db.runCommand(cmdObj) run a database command.  if cmdObj is a string, turns it into { cmdObj : 1 }
+    db.serverStatus()
+    db.setProfilingLevel(level,<slowms>) 0=off 1=slow 2=all
+    db.setVerboseShell(flag) display extra information in shell output
+    db.shutdownServer()
+    db.stats()
+    db.version() current version of the server
+"""

imongo.py

@@ -1,6 +1,7 @@
 from pymongo import MongoClient
 from pymongo.database import Database
 from IPython.core.magic import Magics, magics_class, line_cell_magic, line_magic
+from helps import DB_METHODS
 
 @magics_class
 class MongoDB(Magics):
@@ -35,6 +36,21 @@ def show_collections(self, line):
             collections = self.show_dbs(self)
         return collections
 
+    @line_magic('help')
+    def help_message(self, line):
+        message = ''
+        if line == 'db':
+            message += DB_METHODS
+        else:
+            message += """
+                %help db             help on db methods
+                %help collection     help on collection methods
+
+                %show_dbs            show database names
+                %show_collections    show collections in current database
+            """
+        print message
+
 def load_ipython_extension(ipython):
     ipython.register_magics(MongoDB)