ENH: Allow insertion and deletion of single entities

Summary

See https://gitlab.indiscale.com/caosdb/customers/lfpb/management/-/issues/394. Implementations for entities, parents, and properties were added. The transactions were extended s.th. all objects can be inserted, retrieved, and deleted.

Focus

Most of the new stuff is in entity.cpp and entity.h. See test_entity for the new functionality.

Test Environment

Unit and integration tests should be sufficient.

Check List for the Author

Please, prepare your MR for a review. Be sure to write a summary and a focus and create gitlab comments for the reviewer. They should guide the reviewer through the changes, explain your changes and also point out open questions. For further good practices have a look at our review guidelines

• All automated tests pass
• Reference related Issues
• [ ] Up-to-date CHANGELOG.md
• Annotations in code (Gitlab comments)
  • Intent of new code
  • Problems with old code
  • Why this implementation?

Check List for the Reviewer

• I understand the intent of this MR
• All automated tests pass
• [ ] Up-to-date CHANGELOG.md
• The test environment setup works and the intended behavior is reproducible in the test environment
• In-code documentation and comments are up-to-date.
• Check: Are there spezifications? Are they satisfied?

For further good practices have a look at our review guidelines.

include/caosdb/entity.h

@@ -36,6 +36,7 @@
 namespace caosdb::entity {
 using caosdb::entity::v1alpha1::IdResponse;
 using ProtoParent = caosdb::entity::v1alpha1::Parent;
+using ProtoProperty = caosdb::entity::v1alpha1::Property;
 using ProtoEntity = caosdb::entity::v1alpha1::Entity;
 
 /**
@@ -246,14 +247,35 @@ class Property {
 public:
   explicit inline Property(caosdb::entity::v1alpha1::Property *wrapped)
     : wrapped(wrapped){};
+  Property();
 
-  // TODO(fspreck) All of these methods need implementations.
+  /**
+   * Return the id of this  property
+   */
   [[nodiscard]] auto GetId() const -> const std::string &;
+  /**
+   * Return the name of this  property
+   */
   [[nodiscard]] auto GetName() const -> const std::string &;
+  /**
+   * Return the description of this  property
+   */
   [[nodiscard]] auto GetDescription() const -> const std::string &;
+  /**
+   * Return the importance of this  property
+   */
   [[nodiscard]] auto GetImportance() const -> const std::string &;
+  /**
+   * Return the value of this  property
+   */
   [[nodiscard]] auto GetValue() const -> const std::string &;
+  /**
+   * Return the unit of this  property
+   */
   [[nodiscard]] auto GetUnit() const -> const std::string &;
+  /**
+   * Return the datatype of this  property
+   */
   [[nodiscard]] auto GetDatatype() const -> const std::string &;
   // TODO(fspreck) Implement these when we have decided how to attach
   // messages to properties.
@@ -261,17 +283,51 @@ public:
   // [[nodiscard]] auto GetWarnings() const -> const Messages &;
   // [[nodiscard]] auto GetInfos() const -> const Messages &;
 
+  /**
+   * Set the id of this property.
+   */
   auto SetId(const std::string &id) -> void;
+  /**
+   * Set the name of this property.
+   */
   auto SetName(const std::string &name) -> void;
+  /**
+   * Set the importance of this property.
+   */
   auto SetImportance(const std::string &importance) -> void;
+  /**
+   * Set the value of this property.
+   */
   auto SetValue(const std::string &value) -> void;
+  /**
+   * Set the unit of this property.
+   */
   auto SetUnit(const std::string &unit) -> void;
+  /**
+   * Set the datatype of this property.
+   */
   auto SetDatatype(const std::string &datatype) -> void;
 
+  /**
+   * Return a json string representing this property.
+   *
+   * This is intended for debugging
+   */
+  inline auto ToString() const -> const std::string {
+    google::protobuf::util::JsonOptions options;
+    std::string out;
+    google::protobuf::util::MessageToJsonString(*(this->wrapped), &out,
+                                                options);
+
+    return out;
+  }
+
   friend class Entity;
   friend class Properties;
 
 private:
+  static auto CreateProtoProperty() -> ProtoProperty *;
+
   caosdb::entity::v1alpha1::Property *wrapped;
 };