FacebookFactory defines create_user_if_not_exists as false and the FacebookProvider implementation in the docs has a loadUserByUsername which create a new user if this does not exists and ignore the create_user_if_not_exists options.
What this PR does:
Define create_user_if_not_exists true by default
Add to the documentation a FacebookProvider that creates the user only if create_user_if_not_exists is true.
Users can now switch creation of new users by altering the configuration params and the FacebookProvider implementation looks more obvious.
FacebookFactory defines create_user_if_not_exists as false and the FacebookProvider implementation in the docs has a loadUserByUsername which create a new user if this does not exists and ignore the create_user_if_not_exists options.
What this PR does:
Users can now switch creation of new users by altering the configuration params and the FacebookProvider implementation looks more obvious.
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