fieldSchema.py

from arcgis.gis import GIS
gis = GIS("home")

item_title = 'geodesignTest'

#upload geojson
geojson_item = gis.content.add({
    'type': 'GeoJson',
    'title': item_title
}, data='/arcgis/home/igcTestData/brian-repro-polygons-lines.geojson')

# define fields and types
fields = [
    {"name": "project_or_policy", "type": "esriFieldTypeString", "sqlType": "sqlTypeNVarchar"},
    {"name": "diagram_name", "type": "esriFieldTypeString", "sqlType": "sqlTypeNVarchar"},
    {"name": "color", "type": "esriFieldTypeString", "sqlType": "sqlTypeNVarchar"},
    {"name": "diagram_id", "type": "esriFieldTypeInteger", "sqlType": "sqlTypeInteger"},
    {"name": "tag_codes", "type": "esriFieldTypeString", "sqlType": "sqlTypeNVarchar"},
    {"name": "start_date", "type": "esriFieldTypeDate", "sqlType": "sqlTypeDate"},
    {"name": "end_date", "type": "esriFieldTypeDate", "sqlType": "sqlTypeDate"},
    {"name": "notes", "type": "esriFieldTypeString", "sqlType": "sqlTypeNVarchar"},
    {"name": "grid_location", "type": "esriFieldTypeString", "sqlType": "sqlTypeNVarchar"},
    {"name": "system_name", "type": "esriFieldTypeString", "sqlType": "sqlTypeNVarchar"},
    {"name": "ObjectID", "type": "esriFieldTypeOID", "sqlType": "sqlTypeOther"},
    {"name": "Shape__Area", "type": "esriFieldTypeDouble", "sqlType": "sqlTypeDouble"},
    {"name": "Shape__Length", "type": "esriFieldTypeDouble", "sqlType": "sqlTypeDouble"}
]

# transform to Esri field schema
def transform_field(field):
    transformed_field = {
        "name": field["name"],
        "type": field["type"],
        "alias": field["name"].replace("_", " ").capitalize(),
        "sqlType": field["sqlType"],
        "Noneable": True,
        "editable": False,
        "domain": None,
        "defaultValue": None
    }
    if (field["type"] == "esriFieldTypeString"):
        transformed_field["length"] = 255
    if (field["type"] == "esriFieldTypeDate"):
        transformed_field["length"] = 0
        transformed_field["precision"] = 1
    return transformed_field
        
esri_fields_schema = list(map(transform_field, fields))

# prepare publish parameters
publish_params = {
  "type": "geojson",
  "name": item_title,
  "layers": [
    {
      "name": f"{item_title}_polygons",
      "type": "Feature Layer",
      "geometryType": "esriGeometryPolygon",
      "objectIdField": "ObjectId",
      "fields": esri_fields_schema
    },
      {
      "name": f"{item_title}_points",
      "type": "Feature Layer",
      "geometryType": "esriGeometryPoint",
      "objectIdField": "ObjectId",
      "fields": esri_fields_schema
    },
      {
      "name": f"{item_title}_lines",
      "type": "Feature Layer",
      "geometryType": "esriGeometryPolyline",
      "objectIdField": "ObjectId",
      "fields": esri_fields_schema
    }
  ]
}

# publish as feature layers
feature_layer_item = geojson_item.publish(publish_parameters = publish_params)