Documentation:Database corruption

An inconsistent database is a rare thing when using MDriven Server and Turnkey.

But it can happen, and if it happens it's almost always because of an evolve that went wrong somehow and objects was left behind.

Especially problematic is link-classes with incorrect link information. Because link-objects only can exist when the two connected objects exist, they can't even be loaded into memory.

So, this needs to be corrected at the sql server level.

But, as an MDriven user we really don't want to spend any time on SQL-related things, so, in order to create the SQL that looks up problems, we can use the model debugger on the model itself.

Association.allInstances->
  select(a|a.Class.notNull and a.Class.isPersistent)->
    collect(a|a.Class.Name,
      let ae = a.AssociationEnd->at(1) in
        let c1 = ae.Participant in
          if c1.TaggedValue->exists(tv | (tv.Tag='Eco.TableMapping') and (tv.Value = 'Parent')) then
            c1.Superclass.Name
          else
            c1.Name
          endif->collect(classname|if classname='User' then 'User_TBL' else classname endif)->first,
      let ae = a.AssociationEnd->at(1) in
        ae.Name,
      let ae = a.AssociationEnd->at(1) in
        ae.TaggedValue->select(tv | tv.Tag='Eco.InnerLinkName')->first.Value,
      let ae = a.AssociationEnd->at(2) in
        let c1 = ae.Participant in
          if c1.TaggedValue->exists(tv | (tv.Tag='Eco.TableMapping') and (tv.Value = 'Parent')) then
            c1.Superclass.Name
          else
            c1.Name
          endif->collect(classname|if classname='User' then 'User_TBL' else classname endif)->first,
      let ae = a.AssociationEnd->at(2) in
        ae.Name,
      let ae = a.AssociationEnd->at(2) in
        ae.TaggedValue->select(tv | tv.Tag='Eco.InnerLinkName')->first.Value
)->orderBy(x|x.Name)->
collect(d | 
'select * from ' + d.Name + ' where ' + if d.Part4.isNullOrEmpty then d.Part3 else d.Part4 endif + 'ID not in (select ' + d.Part2 + 'ID from ' + d.Part2 + ')\r\n'+
'select * from ' + d.Name + ' where ' + if d.Part7.isNullOrEmpty then d.Part6 else d.Part7 endif + 'ID not in (select ' + d.Part5 + 'ID from ' + d.Part5 + ')'
)->asSeparatedList('\r\n')