conjunto-formbuilder

A visual form builder for conjunto-based Django projects. Forms are assembled in a UI and stored as JSON — the JSON definition is the contract: build_form(schema) turns it into a live Django form for rendering, validation and cleaned data, without hand-written field code.

The package depends only on Django and conjunto, so it runs in any conjunto project.

Install

pip install conjunto-formbuilder

# settings.py
INSTALLED_APPS = [
    # …
    "conjunto_formbuilder",
]

Concept

[ Builder UI ]  ──►  schema (JSON)  ──►  build_form(schema)  ──►  Django Form

A field descriptor carries more than type/label/required: grid layout coordinates (x/y/w/h) and optional source (queryset autocomplete) / provision (prefill from a registered data source) descriptors.

from conjunto_formbuilder.build import build_form

schema = {
    "version": 1,
    "layout": "grid",
    "columns": 12,
    "fields": [
        {"name": "first_name", "type": "text", "label": "First name", "required": True,
         "grid": {"x": 0, "y": 0, "w": 6, "h": 1}},
        {"name": "birth_date", "type": "date", "label": "Date of birth",
         "grid": {"x": 6, "y": 0, "w": 6, "h": 1}},
    ],
}

form = build_form(schema, data=request.POST or None)
if form.is_valid():
    ...  # form.cleaned_data

Extending

• Field types — register a FieldType with conjunto_formbuilder.registry.register_field_type.

Data sources

A field's source (autocomplete) and provision (prefill) descriptors never name a model or queryset directly — that would let a stored form definition reach into arbitrary tables. Instead they name a provider by its key. A provider is a conjunto_formbuilder.datasources.IDataSource (a GDAPS interface) you implement; it returns data through its own, typically tenant-aware, queryset and is responsible for validating the params it accepts.

from conjunto_formbuilder.datasources import IDataSource
from myapp.models import Country


class CountrySource(IDataSource):
    """Generic model-queryset provider: autocomplete + prefill for countries."""

    key = "myapp.country"

    def get_queryset(self, request, params):
        # Scope here (tenant, permissions, params) — this is the trust boundary.
        return Country.objects.all()

    def search(self, request, params, query):
        # Candidates for the typed query; the options partial renders each as
        # ``{{ obj.pk }}`` / ``{{ obj }}``.
        return self.get_queryset(request, params).filter(name__icontains=query)[:20]

    def resolve(self, request, params):
        # A single value to prefill the field with, or ``None``.
        return self.get_queryset(request, params).values_list("pk", flat=True).first()

Reference it from a field:

{"name": "country", "type": "autocomplete",
 "source":    {"provider": "myapp.country", "params": {}},
 "provision": {"provider": "myapp.country", "params": {}}}

build_form wires the autocomplete widget's URL to the AutocompleteOptionsView, carrying the provider key (and any params) as query arguments; the widget sends the typed text as ?q=…. The view resolves the provider against the registry only — an unknown key yields 404. When the builder URLs are mounted under a different namespace, override the reversed URL name via the autocomplete_url_name= argument of build_form_class or the CONJUNTO_FORMBUILDER_AUTOCOMPLETE_URL_NAME setting.

License

AGPL-3.0-or-later.