✨ Add search and editing support for Relation Reference widget (1:N relations)

[wlorenzetti]

Summary

Parse RelationReference settings when uploading QGIS project inside G3W-SUITE and send it to g3w-client for editing and searching actions.

For search widget, if the field of searching has a ReltionReference QGIS form widget and if a 'Selectbox' or a 'Autocompletyebox' is set fro the search widget, now is possibile set the the use fo RelationReference into the serchign form:

In client seraching configs into options section you'll find the boolean property relation_reference:

"queryurl": null,
"title": "ricerca per relationreferance",
"results": [],
"filter": [{
  "op": "eq",
  "attribute": "gid_padre",
  "label": "",
  "input": {
    "type": "selectfield",
    "options": {
      "numdigaut": "2",
      "relation_reference": true,
      "values": [],
      "blanktext": ""
    }
  },
  "logicop": "AND"
}],
"dozoomtoextent": true,
"otherquerylayerids": null,
"layerid": "figlio_9fbf65ac_4c99_4606_9a49_3db065402a37",
"querylayerid": "figlio_9fbf65ac_4c99_4606_9a49_3db065402a37"

Closes: #616

[wlorenzetti]

@volterra79 for search widget, if the field of searching has a ReltionReference QGIS form widget and if a 'Selectbox' or a 'Autocompletyebox' is set fro the search widget, now is possibile set the the use fo RelationReference into the serchign form:

And in the client seraching configs into options section you'll find the boolean property relation_reference:

"queryurl": null,
                "title": "ricerca per relationreferance",
                "results": [],
                "filter": [
                    {
                        "op": "eq",
                        "attribute": "gid_padre",
                        "label": "",
                        "input": {
                            "type": "selectfield",
                            "options": {
                                "numdigaut": "2",
                                "relation_reference": true,
                                "values": [],
                                "blanktext": ""
                            }
                        },
                        "logicop": "AND"
                    }
                ],
                "dozoomtoextent": true,
                "otherquerylayerids": null,
                "layerid": "figlio_9fbf65ac_4c99_4606_9a49_3db065402a37",
                "querylayerid": "figlio_9fbf65ac_4c99_4606_9a49_3db065402a37"
            }
        }