slack avatar urls have the format:
'https://ca.slack-edge.com/<team_id>-<user_id>-<avatar_hash>-<size>'
For any url of this form, if the user hasn't uploaded an image,
Slack uses default gravatar, but we don't have a way of knowing if Slack
has used the uploaded image or the custom gravatar
eg: https://ca.slack-edge.com/T5YFFM2QY-U6006P1CN-gd41c3c33cbe-512.
Hence, avatar_source should be mapped to 'U'.
The check for the channel ('general' and 'random') must be added before
'build_defaultstream' function is called and then the id is incremented.
Otherwise, the id appended at the end of second defaultstream object, which would be
greater than the total number of defaultstream objects would crash at
'defaultstream_id_list[defaultstream_id]' which is a paramater of 'build_defaultstream'.
Added tests to prevent the same.
We use the command
'select nextval('sequence') from generate_series(1, increment_number)'
which returns a list of allocated values for the ids.
This list is used to assign ids to the to be converted objects.
The fresh imported data shows that the users emails are not included
in the data. However, the data received from the older method of slack
(which is using legacy tokens) contains the email data of the users.
Rhea Parekh