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Changes in creating queries
===========================
To get a list of packages based on given criteria, they can be queried using ``dnf.query.Query`` class in DNF4 and ``libdnf5::rpm::PackageQuery`` class in DNF5.
In DNF4, the ``filter`` method doesn't actually modify the query, but rather return a new query limiting it according to the given arguments. In DNF5, the original query is modifed by the filters.
DNF4 Python:
.. code-block:: python
:linenos:
# Create a package query.
packages = base.sack.query()
# Filter the packages, the filters can be stacked one after another.
packages = packages.filter(name="one")
# Iterate over the filtered packages in the query.
for pkg in packages:
print(pkg.name)
DNF5 Python:
.. literalinclude:: ../tests/bindings/python3/api_changes_from_dnf4/package_query.py
:language: py
:linenos:
DNF5 C++:
.. literalinclude:: ../tests/api_changes_from_dnf4/package_query.cpp
:language: c++
:linenos:
:lines: 2,4-
The groups and environments are in DNF4 stored in the ``dnf.comps.Comps`` class, which is different from a query object, though it also provides some filtering. In DNF5, the groups and environments are queried using the ``libdnf5::comps::GroupQuery`` and ``libdnf5::comps::EnvironmentQuery`` classes respectively, similarly to the ``libdnf5::rpm::PackageQuery`` class. The example shows querying groups, but the environments are analogous.
DNF4 Python:
.. code-block:: python
:linenos:
# Get all groups.
groups = base.comps.groups
# Or get groups with a given pattern in id or name.
groups = groups_by_pattern("group-id")
# Iterate over the groups.
for group in groups:
print(group.ui_name)
DNF5 Python:
.. literalinclude:: ../tests/bindings/python3/api_changes_from_dnf4/group_query.py
:language: py
:linenos:
DNF5 C++:
.. literalinclude:: ../tests/api_changes_from_dnf4/group_query.cpp
:language: c++
:linenos:
:lines: 2,4-
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