old_contents: from modules.serializers import ModuleSerializer
  from persons.serializers import PersonSerializer, UserSerializer
  from rest_framework import serializers
  
  from .models import Program, TrainingTarget, ProgramCompetence, ProgramModules, TargetModules, ChoiceGroup, \
      ChoiceGroupType, StudentProgram
  
  
  class ProgramCompetenceSerializer(serializers.ModelSerializer):
      class Meta:
          model = ProgramCompetence
          fields = ("id", "title", "number")
  
  
  class ProgramSerializer(serializers.ModelSerializer):
      chief = PersonSerializer(
          many=False,
          read_only=False,
      )
  
      class Meta:
          model = Program
          fields = ("id", "title", "chief", "get_level_display", "get_choice_groups", "training_direction", "competences",
                    "get_competences_diagram")
  
  
  class TrainingTargetSerializer(serializers.ModelSerializer):
      program = ProgramSerializer
  
      class Meta:
          model = TrainingTarget
          fields = ("id", "title", "program", "number")
  
  
  class ChoiceGroupTypeSerializer(serializers.ModelSerializer):
      class Meta:
          model = ChoiceGroupType
          fields = ("id", "title")
  
  
  class ChoiceGroupSerializer(serializers.ModelSerializer):
      program = ProgramSerializer
  
      class Meta:
          model = ChoiceGroup
          fields = ("id", "program", "title", "labor", "get_choice_group_type_display", "get_program_modules", "number")
  
  
  class ProgramModulesSerializer(serializers.ModelSerializer):
      program = ProgramSerializer
      module = ModuleSerializer
      choice_group = ChoiceGroupSerializer
      competence = ProgramCompetenceSerializer
  
      class Meta:
          model = ProgramModules
          fields = ("id", "program", "module", "choice_group", "get_competence_display", "semester")
  
  
  class TargetModulesSerializer(serializers.ModelSerializer):
      target = TrainingTargetSerializer
      program_module = ProgramModulesSerializer
      choice_group = ChoiceGroupSerializer
  
      class Meta:
          model = TargetModules
          fields = ("id", "target", "program_module", "choice_group")
  
  
  class StudentProgramSerializer(serializers.ModelSerializer):
      program = ProgramSerializer
      user = UserSerializer
  
      class Meta:
          model = StudentProgram
          fields = ("link", "user", "program", "json")
  
  
  class StudentProgramSerializer_nouser(serializers.ModelSerializer):
      program = ProgramSerializer
      program_name = program.data()
  
      class Meta:
          model = StudentProgram
          fields = ("id", "program", "program_name", "json")
  
new_contents: from modules.serializers import ModuleSerializer
  from persons.serializers import PersonSerializer, UserSerializer
  from rest_framework import serializers
  
  from .models import Program, TrainingTarget, ProgramCompetence, ProgramModules, TargetModules, ChoiceGroup, \
      ChoiceGroupType, StudentProgram
  
  
  class ProgramCompetenceSerializer(serializers.ModelSerializer):
      class Meta:
          model = ProgramCompetence
          fields = ("id", "title", "number")
  
  
  class ProgramSerializer(serializers.ModelSerializer):
      chief = PersonSerializer(
          many=False,
          read_only=False,
      )
  
      class Meta:
          model = Program
          fields = ("id", "title", "chief", "get_level_display", "get_choice_groups", "training_direction", "competences",
                    "get_competences_diagram")
  
  
  class TrainingTargetSerializer(serializers.ModelSerializer):
      program = ProgramSerializer
  
      class Meta:
          model = TrainingTarget
          fields = ("id", "title", "program", "number")
  
  
  class ChoiceGroupTypeSerializer(serializers.ModelSerializer):
      class Meta:
          model = ChoiceGroupType
          fields = ("id", "title")
  
  
  class ChoiceGroupSerializer(serializers.ModelSerializer):
      program = ProgramSerializer
  
      class Meta:
          model = ChoiceGroup
          fields = ("id", "program", "title", "labor", "get_choice_group_type_display", "get_program_modules", "number")
  
  
  class ProgramModulesSerializer(serializers.ModelSerializer):
      program = ProgramSerializer
      module = ModuleSerializer
      choice_group = ChoiceGroupSerializer
      competence = ProgramCompetenceSerializer
  
      class Meta:
          model = ProgramModules
          fields = ("id", "program", "module", "choice_group", "get_competence_display", "semester")
  
  
  class TargetModulesSerializer(serializers.ModelSerializer):
      target = TrainingTargetSerializer
      program_module = ProgramModulesSerializer
      choice_group = ChoiceGroupSerializer
  
      class Meta:
          model = TargetModules
          fields = ("id", "target", "program_module", "choice_group")
  
  
  class StudentProgramSerializer(serializers.ModelSerializer):
      program = ProgramSerializer
      user = UserSerializer
  
      class Meta:
          model = StudentProgram
          fields = ("link", "user", "program", "json")
  
  
  class StudentProgramSerializer_nouser(serializers.ModelSerializer):
      program = ProgramSerializer
      program_name = serializers.CharField(source='program.title')
  
      class Meta:
          model = StudentProgram
          fields = ("id", "program", "program_name", "json")
  
subject: add program_name to trajectory#3