django-nominopolitan 0.1.8

Neapolitan with namespaces - Django CRUD views

Nominopolitan

This is an opinionated extension package for the excellent neapolitan package. It adds these features:

Status

Extremely early alpha. No tests. Limited docs. Suggest at this stage just use it as a reference and take what you need. It works for me.

Features

Namespacing

• Namespaced URL handling namespace="my_app_name"

Templates

• Allow specification of base_template_path (to your base.html template)
• Allow override of all nominopolitan templates by specifying templates_path
• Management command nm_mktemplate to copy required nominopolitan template (analagous to neapolitan's mktemplate)

Display

• Display related field name (using str()) in lists and details (instead of numeric id)
• Header title context for partial updates (so the title is updated without a page reload)

Extended fields and properties attributes

• fields=<'__all__' | [..]> to specify which fields to include in list view
• properties=<'__all__' | [..]> to specify which properties to include in list view
• detail_fields and detail_properties to specify which to include in detail view
• Support exclusions via exclude, exclude_properties, detail_exclude, detail_exclude_properties
• Support for extra_actions to add additional actions to list views

Filtersets

• object_list.html styled for bootstrap to show filters.
• if filterset_fields is specified, style with crispy_forms if present and set htmx attributes if applicable
• if filterset_class is provided, then option to subclass HTMXFilterSetMixin and use self.setup_htmx_attrs() in __init__()
• You can now override the method get_filter_queryset_for_field(self, field_name, model_field) to restrict the available options for a filter field.

  • field_name: The name of the field being filtered (str)

  • model_field: The actual Django model field instance (e.g., ForeignKey, CharField)

  • For example, if you're already restricting the returned objects by overriding get_queryset(), then you want the filter options for foreign key fields to also be subject to this restriction.

  • So you can override get_filter_queryset_for_field() to return the queryset for the field, but filtered by the same restriction as your overridden get_queryset() method.

    # Example of overrides of get_queryset and get_filter_queryset_for_field
    # def get_queryset(self):
    #     qs = super().get_queryset()
    #     qs = qs.filter(author__id=20)
    #     return qs.select_related('author')
    
    # def get_filter_queryset_for_field(self, field_name, model_field):
    #     """Override to restrict the available options if the field is author.
    #     """
    #     qs = super().get_filter_queryset_for_field(field_name, model_field)
    #     print(field_name)
    #     if field_name == 'author':
    #         qs = qs.filter(id=20)
    #     return qs
    

htmx and modals

• Support for rendering templates using htmx
• Support for modal display of CRUD view actions (requires htmx -- and Alpine for bulma)
• htmx supported pagination (requires use_htmx = True) for reactive loading
• Support to specify hx_trigger and set response['HX-Trigger'] for every response

Styled Templates

• Supports bootstrap5 (default framework). To use a different CSS framework:
  • Set NOMINOPOLITAN_CSS_FRAMEWORK = '<framework_name>' in settings.py
  • Create corresponding templates in your templates_path directory
  • Override NominopolitanMixin.get_framework_styles() in your view to add your framework's styles,
    set the framework key to the name of your framework and add the required values.

Forms

• if form_class is not specified, then non-editable fields are automatically excluded from forms
• Optional create_form_class for create operations:
  • Allows a separate form class specifically for create views
  • Useful when create and update forms need different: Field sets, Validation logic, Base classes
  • Falls back to form_class if not specified
• Support for crispy-forms if installed in project and use_crispy parameter is not False
  • make sure you have crispy_bootstrap5 also installed if you want
  • if you have set up a different library use the correct crispy package (eg crispy_bulma, crispy_tailwind)

Styled Table Options

• set table_font_size as a parameter, measured in rem. eg table_font_size = 0.875. This will be applied to buttons, filters and the table data itself using the custom style in object_list.html: .table-font-size {font-size: {{ table_font_size }};}.

• set table_max_col_width as a parameter, measured in ch (ie number of 0 characters in the current font). eg table_max_col_width = 10:

  • limit the width of the column to these characters and truncate the data text if needed.
  • if a field is truncated, a popover will be shown with the full text (requires popper.js be installed)
  • column headers will be wrapped to the width of the column (as determined by width of data items)

• to calculate the maximum height of the object_list table, we allow setting of 2 parameters:

  • table_pixel_height_other_page_elements (default = 150), expressed in pixels.
  • table_max_height: (default = 80), expressed as vh units (ie percentage) of the remaining blank space after subtracting table_pixel_height_other_page_elements
  • In the partial list.html these parameters are used to calculate table-max-height as below:

  <style>
      .table-max-height {
          /* max-height: {{ table_max_height }}; */
          max-height: calc((100vh - {{ table_pixel_height_other_page_elements }}) * {{ table_max_height }} / 100);
      }
  </style>
  

  • You can tune these parameters depending on the page that the table is appearing on to get the right table height.
  • crazy right? But it works.

Table Sorting

• click table header to toggle sorting direction (columns start off unsorted)
• the method always includes a secondary sort by primary key for stable pagination
• will use htmx if use_htmx is True
• current list.html template will display bootstrap icons (if installed) for sorting direction:
  • you must install bootstrap icons to use this feature

sample App

• sample app is a simple example of how to use django_nominopolitan. It's available in the repository and not part of the package.
• it includes management commands create_sample_data and delete_sample_data

This is a very early alpha release; expect many breaking changes. You might prefer to just fork or copy and use whatever you need. Hopefully some or all of these features may make their way into neapolitan over time.

Management Commands

• nm_mktemplate:

  • This is the same as neapolitan's mktemplate command except it copies from the nominopolitan templates instead of the neapolitan templates.

  • It's the same syntax as neapolitan's mktemplate command:

    python manage.py nm_mktemplate <app_name>.<model_name> --<suffix>
    

• nm_clear_session_keys

  • Used to clear all user session keys related to nominopolitan

• nm_help

  • Displays the Nominopolitan README.md documentation in a paginated format
  • --lines to specify number of lines to display per page (default: 20)
  • --all to display entire content without pagination

Installation

With pip: pip install django-nominopolitan

Poetry: poetry add django-nominopolitan

Configuration

Add these to your settings.py:

INSTALLED_APPS = [
    ...
    "nominopolitan", # put this before neapolitan
    "neapolitan",    # this is required to use the `NominopolitanMixin`
    ...
]

In addition:

1. If you want to set use_htmx = True, then make sure htmx is installed in your base template and django_htmx is installed.
2. If you want to set use_modal = True, it requires use_htmx=True (see above) and alpinejs is installed in your base template.

Usage

The best starting point is neapolitan's docs. The basic idea is to specify model-based CRUD views using:

# neapolitan approach
class ProjectView(CRUDView):
    model = projects.models.Project
    fields = ["name", "owner", "last_review", "has_tests", "has_docs", "status"]

The nominopolitan mixin adds a number of features to this. The values below are indicative examples.

from nominopolitan.mixins import NominopolitanMixin
from neapolitan.views import CRUDView

class ProjectCRUDView(NominopolitanMixin, CRUDView):
    # *******************************************************************
    # Standard neapolitan attributes
    model = models.Project
    fields = [
        "name", "project_owner", "project_manager", "due_date",
        ]

    form_class = forms.ProjectForm # standard neapolitan setting if needed
    # ...other standard neapolitan attributes
    # ******************************************************************
    # nominopolitan attributes

    # which fields and properties to include in the list view
    fields = '__all__' # if you want to include all fields
        # you can omit the fields attribute, in which case it will default to '__all__'

    exclude = ["description",] # list of fields to exclude from list

    properties = ["is_overdue",] # if you want to include @property fields in the list view
        # properties = '__all__' if you want to include all @property fields

    properties_exclude = ["is_overdue",] # if you want to exclude @property fields from the list view

    # sometimes you want additional fields in the detail view
    detail_fields = ["name", "project_owner", "project_manager", "due_date", "description",]
        # or '__all__' to use all model fields
        # or '__fields__' to use the fields attribute
        # if you leave detail_fields to None, it will default be treated as '__fields__'

    detail_exclude = ["description",] # list of fields to exclude from detail view

    detail_properties = '__all__' # if you want to include all @property fields
        # or a list of valid properties
        # or '__properties__' to use the properties attribute

    detail_properties_exclude = ["is_overdue",] # if you want to exclude @property fields from the detail view

    namespace = "my_app_name" # specify the namespace 
        # if your urls.py has app_name = "my_app_name"

    # filtersets
    filterset_fields = ["name", "project_owner", "project_manager", "due_date",]
        # this is a standard neapolitan parameter, but nominopolitan converts this 
        # to a more elaborate filterset class

    # Forms
    use_crispy = True # will default to True if you have `crispy-forms` installed
        # if you set it to True without crispy-forms installed, it will resolve to False
        # if you set it to False with crispy-forms installed, it will resolve to False

    create_form_class = forms.ProjectCreateForm # if you want a separate create form
        # the update form always uses form_class
    
    # Templates
    base_template_path = "core/base.html" # defaults to inbuilt "nominopolitan/base.html"
    templates_path = "myapp" # if you want to override all the templates in another app
        # or include one of your own apps; eg templates_path = "my_app_name/nominopolitan" 
        # and then place in my_app_name/templates/my_app_name/nominopolitan

    # table display parameters
    table_pixel_height_other_page_elements = 100 # this will be expressed in pixels
    table_max_height = 80 # as a percentage of remaining viewport height
    table_font_size = '1.05' # expressed as rem
    table_max_col_width = '25' # expressed as `ch` (characters wide)

    # htmx & modals
    use_htmx = True # if you want the View, Detail, Delete and Create forms to use htmx
        # if you do not set use_modal = True, the CRUD templates will be rendered to the
        # hx-target used for the list view
        # Requires:
            # htmx installed in your base template
            # django_htmx installed and configured in your settings

    hx_trigger = 'changedMessages'  # Single event trigger (strings, numbers converted to strings)
        # Or trigger multiple events with a dict:
            # hx_trigger = {
            #     'changedMessages': None,    # Event without data
            #     'showAlert': 'Success!',    # Event with string data
            #     'updateCount': 42           # Event with numeric data
            # }
        # hx_trigger finds its way into every response as:
            # request['HX-Trigger'] = self.get_hx_trigger() in self.render_to_response()
        # valid types are (str, int, float, dict)
            # but dict must be of form {k:v, k:v, ...} where k is a string and v can be any valid type


    use_modal = True #If you want to use the modal specified in object_list.html for all action links.
        # This will target the modal (id="nominopolitanModalContent") specified in object_list.html
        # Requires:
            # use_htmx = True
            # Alpine installed in your base template
            # htmx installed in your base template
            # django_htmx installed and configured in your settings

    modal_id = "myCustomModalId" # Allows override of the default modal id "nominopolitanBaseModal"

    modal_target = "myCustomModalContent" # Allows override of the default modal target
        # which is #nominopolitanModalContent. Useful if for example
        # the project has a modal with a different id available
        # eg in the base template. This is where the modal content will be rendered.

    # extra actions (extra buttons for each record in the list)
    extra_actions = [ # adds additional actions for each record in the list
        {
            "url_name": "fstp:do_something",  # namespace:url_pattern
            "text": "Do Something",
            "needs_pk": False,  # if the URL needs the object's primary key
            "hx_post": True, # use POST request instead of the default GET
            "button_class": "is-primary", # semantic colour for button (defaults to "is-link")
            "htmx_target": "content", # htmx target for the extra action response 
                # (if use_htmx is True)
                # NB if you have use_modal = True and do NOT specify htmx_target, then response
                # will be directed to the modal 
            "display_modal": False, # when use_modal is True but for this action you do not
                # want to use the modal for whatever is returned from the view, set this to False
                # the default if empty is True
        },
    ]