After catkin migration import error

edit

Hi,

I have a working project in Fuerte, but when I tried to migrate code to Groovy and catkin I see the following:

    in <module>
    import mongo_ros as mr 
ImportError: No module named mongo_ros

What I forgot?
catkin_make works correctly but in execution pyhton do not found mongo_ros package. I installed warehousewg from apt-get and "roscd mongo_ros" also works.

EDIT:

Thanks for your quick response. I have followed catkin overlay tutorial but the problem persists. I can do roscd mongo_ros and works correctly like in the tutorial, but in execution python do not find mongo_ros package.

May be I don't have successfully created the package configuration and depends. I follow My package.xml file contains the following:

    <!-- The *_depend tags are used to specify dependencies -->
  <!-- Dependencies can be catkin packages or system dependencies -->
  <!-- Examples: -->
  <!-- Use build_depend for packages you need at compile time: -->
  <build_depend>message_generation</build_depend> 
  <!-- Use buildtool_depend for build tool packages: -->
  <!--   <buildtool_depend>catkin</buildtool_depend> -->
  <!-- Use run_depend for packages you need at runtime: -->
  <run_depend>message_runtime</run_depend> 
  <!-- Use test_depend for packages you need only for testing: -->
  <!--   <test_depend>gtest</test_depend> -->
  <buildtool_depend>catkin</buildtool_depend>
  <build_depend>control_msgs</build_depend>
  <build_depend>rospy</build_depend>
  <build_depend>mongo_ros</build_depend>
  <build_depend>std_msgs</build_depend>
  <build_depend>tf</build_depend>
  <run_depend>control_msgs</run_depend>
  <run_depend>mongo_ros</run_depend>
  <run_depend>rospy</run_depend>
  <run_depend>std_msgs</run_depend>
  <run_depend>tf</run_depend>

And CMakeList.txt:

find_package(catkin REQUIRED COMPONENTS
  control_msgs
  rospy
  std_msgs
  tf
  #mongo_ros
)

I have comment mongo_ros because I obtain cmake error:

CMake Error at /opt/ros/groovy/share/catkin/cmake/catkinConfig.cmake:72 (find_package):
  Could not find a configuration file for package mongo_ros.

  Set mongo_ros_DIR to the directory containing a CMake configuration file
  for mongo_ros.  The file will have one of the following names:

    mongo_rosConfig.cmake
    mongo_ros-config.cmake

Why I obtain this CMake error? It seems that the problem is related with this...

Thank you, regards.