Unlike the Compute object, the Molecule, KeywordSet, Collection, and KVStore objects are always added/queried directly to the server instances as these structures are not acted upon by the server itself.

## Adding Objects to the Server¶

A list of objects can be added to the server via client.add_* commands which return the ObjectId of the object instance.

>>> helium = ptl.Molecule.from_data("He 0 0 0")
['5b882c957b87878925ffaf22']


Any attempt to add the same molecule again will not proceed and the same ObjectId will always be returned:

>>> helium = ptl.Molecule.from_data("He 0 0 0")
['5b882c957b87878925ffaf22', '5b882c957b87878925ffaf22']


Note that the order of ObjectId’s are identical to the order of molecules in the input list.

Note

The ObjectId can change between object instances but it is unique within a particular database.

## Querying Objects from the Server¶

Each server object has a set of fields that can be queried to obtain the object instances in addition to their ObjectId. All queries will return a list of objects.

## Interacting with Molecules on the Server¶

As an example, we can use a molecule that comes with QCPortal and add it to the database. Please note that the Molecule ID (a ObjectId) shown below will not be the same as your result and will be unique for each database.

>>> hooh = ptl.Molecule.from_data("""
>>>        H          1.8486716127,  1.472346669,  0.644643566
>>>        O          1.3127881568, -0.130419379, -0.211892270
>>>        O         -1.3127927010,  0.133418733, -0.211896415
>>>        H         -1.8386801669, -1.482348324,  0.644636970
>>>        """)
>>> hooh
Geometry (in Angstrom), charge = 0.0, multiplicity = 1:

Center              X                  Y                   Z
------------   -----------------  -----------------  -----------------
H          0.977494197627     0.778135098208     0.428565624355
O          0.694599115267    -0.068915578683    -0.027163830307
O         -0.694920304666     0.069482110511    -0.026567833892
H         -0.972396644160    -0.787126321701     0.424194864034


>>> client.query_molecules(molecule_hash=[hooh.get_hash()])[0].id