[QGIS-Developer] QgsProcessingParameterProviderConnection using cached database connections

[Bo Victor Thomsen]

Ok, I'm developing a processing plugin with two algorithms:

  * The first algorithm: The user provides a number of informations
    about a /new/ database. The algorithm creates the new database using
    the information - and creates postgis extension, schemas and some
    tables in the new database.
    And lastly: it creates a database connection for the new database in
    QGIS.

  * The second algorithm: The user chooses a database connection from a
    combobox created using the
    /QgsProcessingParameterProviderConnection/ class. Finally the
    algorithm creates and populates a number of tables using the chosen
    connection

However: If you use the first algorithm to create the database and 
immediately uses the second algorithm trying to populate the new 
database, the connection is /not/ listed in the combobox.

I suspect it's because the /QgsProcessingParameterProviderConnection /is 
using the cached list of  connections when populating the dropdown list/
/

Somewhat like this (in Python):

metadata = QgsProviderRegistry.instance().providerMetadata('postgres')
pg_connections = metadata.connections(cached=True) # Read the cached 
settings

I've had a similar problem in the past that was solved by changing the 
"cached=True" to "cached=False" thereby forcing a reread of the 
connection list.

If you restart QGIS after running algorithm no 1 and /then/ runs 
algorithm no 2 it works like a charm.

My question: Is it possible to force 
/QgsProcessingParameterProviderConnection /to re-read the list of 
connections ? And, if possible, how ??


-- 

Med venlig hilsen / Best regards

Bo Victor Thomsen
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