Allow adding children to a ManyToMany before it's saved
Requires two changes:
1. Save the parent mapper before saving its "fields"
2. Join table records' foreign key to the parent should be set to its primary key automatically.
See https://groups.google.com/d/topic/liftweb/MrSby8v90qM/discussion
1. Save the parent mapper before saving its "fields"
2. Join table records' foreign key to the parent should be set to its primary key automatically.
See https://groups.google.com/d/topic/liftweb/MrSby8v90qM/discussion
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