Path Template Problems In Templates.py

by ADMIN 39 views

Problem Description

When working with templates in the templates.py file, a common issue arises when trying to access a template path. The error message indicates that the template path does not exist, even though the model name is properly specified. This problem is particularly evident when using the uesgraph version after resolving issue 28.

Error Message

# Check if template path exists
    119 if not os.path.isfile(self.save_path):
--> 120     raise FileNotFoundError(f"No template found for model {self.model_name} at {self.save_path} with model type {self.template_directory} and directory: {self.template_directory}")

FileNotFoundError: No template found for model AixLib.Fluid.DistrictHeatingCooling.Pipes.PlugFlowPipeEmbedded at [d:\rka-lko\git\hassel_MA\Transurban_hassel\dhc_model\workspace\AixLib_Fluid_DistrictHeatingCooling_Pipes_PlugFlowPipeEmbedded](file:///D:/rka-lko/git/hassel_MA/Transurban_hassel/dhc_model/workspace/AixLib_Fluid_DistrictHeatingCooling_Pipes_PlugFlowPipeEmbedded) with model type Pipe

Problem Background

The uesgraph package natively supports two ways of using templates:

  1. Standard Library Templates: If the model/template is part of the uesgraphs/aixlib standard library, the module name with reference to the model type is sufficient to take the template accordingly.
  2. Custom Templates: If the model is not part of the standard library, it can still be used by providing a hard-coded or absolute path.

However, the realization of this concept depends on two attributes that are obscured by a superfluous parameter. In this article, we will focus on the pipes and edges in our graph to assign a template to an edge.

Important Attributes

To assign a template to an edge, the two attributes of an edge are crucial:

  • comp_model: The name of the Mako template.
  • template_path: The absolute path to the template.

When calling the create_model in utilities.py, the parameter model_pipe is mandatory and implies that a template is assigned that way. The value of model_pipe is set to comp_model of every pipe in case of a list of pipes defined as an object of the uesgraph itself.

Problem Causing the Exception

The problem causing the exception is when providing a relative path or just the Mako name in ["template_path"] since the current code converts it to an absolute path, which results in an obscure path that probably doesn't exist.

Suggested Solution

To resolve this issue, we suggest the following actions:

Action for Usage

  • When using standard templates of uesgraphs, set template_path = None and use comp_model to specify the template name (without .mako).
  • When using custom templates, use template_path as an ABSOLUTE PATH with .mako. It doesn't harm to also set comp_model to the template/component name.

Action for Coding

  • If template_path is not None, an assertion shall assure to have an absolute path and that its ending with .mako.

By following these suggested solutions, we can resolve the path template problems in templates.py and ensure that our templates are accessed correctly.

Implementation

To implement the suggested solution, we need to modify the create_model function in utilities.py to check if template_path is None or not. If it's not None, we need to assert that it's an absolute path and ends with .mako.

Here's an example implementation:

def create_model(self, model_pipe):
    # ...
    if template_path is not None:
        assert os.path.isabs(template_path)
        assert template_path.endswith('.mako')
    # ...

By implementing this change, we can ensure that the template_path is correctly handled, and the path template problems in templates.py are resolved.

Conclusion

Q: What is the problem with the template path in templates.py?

A: The problem is that the template path is not being accessed correctly, resulting in a FileNotFoundError. This is because the current code converts the relative path or Mako name in ["template_path"] to an absolute path, which results in an obscure path that probably doesn't exist.

Q: What are the two ways of using templates in uesgraph?

A: The uesgraph package natively supports two ways of using templates:

  1. Standard Library Templates: If the model/template is part of the uesgraphs/aixlib standard library, the module name with reference to the model type is sufficient to take the template accordingly.
  2. Custom Templates: If the model is not part of the standard library, it can still be used by providing a hard-coded or absolute path.

Q: What are the important attributes for assigning a template to an edge?

A: To assign a template to an edge, the two attributes of an edge are crucial:

  • comp_model: The name of the Mako template.
  • template_path: The absolute path to the template.

Q: What is the problem causing the exception in create_model function?

A: The problem causing the exception is when providing a relative path or just the Mako name in ["template_path"] since the current code converts it to an absolute path, which results in an obscure path that probably doesn't exist.

Q: What is the suggested solution to resolve the path template problems in templates.py?

A: To resolve this issue, we suggest the following actions:

Action for Usage

  • When using standard templates of uesgraphs, set template_path = None and use comp_model to specify the template name (without .mako).
  • When using custom templates, use template_path as an ABSOLUTE PATH with .mako. It doesn't harm to also set comp_model to the template/component name.

Action for Coding

  • If template_path is not None, an assertion shall assure to have an absolute path and that its ending with .mako.

Q: How can I implement the suggested solution in create_model function?

A: To implement the suggested solution, you need to modify the create_model function in utilities.py to check if template_path is None or not. If it's not None, you need to assert that it's an absolute path and ends with .mako.

Here's an example implementation:

def create_model(self, model_pipe):
    # ...
    if template_path is not None:
        assert os.path.isabs(template_path)
        assert template_path.endswith('.mako')
    # ...

Q: What are the benefits of implementing the suggested solution?

A: By implementing the suggested solution, you can ensure that the template_path is correctly handled, and the path template problems in templates.py are resolved. This will prevent the FileNotFoundError and ensure that your templates are accessed correctly.

Q: Can I use relative paths in template_path?

A: No, it's not recommended to use relative paths in template_path. Instead, use absolute paths with .mako extension. This will ensure that the template path is correctly accessed and the path template problems are resolved.

Q: Can I use custom templates with standard templates?

A: Yes, you can use custom templates with standard templates. However, you need to set template_path as an absolute path with .mako extension and set comp_model to the template/component name. This will ensure that the custom template is correctly accessed and the path template problems are resolved.