problems with variability of records and warnings that its values are not assigned.

[Michael Wetter]

If the model below is simulated using
loadModel(TestRecord);
simulate(TestRecord.myModelInstance);
getErrorString();

then the following error occurs:

messages = "Simulation failed for model: TestRecord.myModelInstance
home/mwetter/proj/ldrd/bie/modeling/bie/branches/mwetter/openmodelica/TestRecord.mo:11:5-11:60:writable Error: Component mymodel.p of variability PARAM has binding mytwo of higher variability VAR.

Since mymodel.p is a record in which all members are parameters, my interpretation is that its variability should also be PARAM as opposed to VAR.

If the line

TestRecord.myRecords.myTwo mytwo;

is changed to

parameter TestRecord.myRecords.myTwo mytwo;

then the model simulates, and computes the correct result mymodel.x=2. However, the warning

Warning: Parameter mymodel.p.r has neither value nor start value, and is fixed during initialization (fixed=true)

occurs despite that r is assigned the value 2 in the declaration of myTwo.

//////////////////////////////////////
within ;
package TestRecord
  package myRecords
    record myTwo = myRecords.BaseRecord(r = 2);
    record BaseRecord
      parameter Real r;
    end BaseRecord;
  end myRecords;

  model myModel
    replaceable parameter TestRecord.myRecords.BaseRecord p;
    Real x;
  equation
    x=p.r;
  end myModel;

  model myModelInstance
    TestRecord.myRecords.myTwo mytwo;
    TestRecord.myModel mymodel(p = mytwo);
  end myModelInstance;

  annotation(uses(Modelica(version = "3.1")));

end TestRecord;
//////////////////////////////////////

[Per Östlund]

There's no rule in the Modelica specification that says that a record where all the fields are parameters should also be considered a parameter, so prefixing the record instance with parameter is required in this case. In that case the model compiles without any warnings now, so I'll consider this fixed.