Collection base

Collection base - an attribute in the object, by the value of which the search of objects in the collection is performed. The search is based on the comparison of collection base with the back reference attribute.

Purpose of use

The base of the collection can be used to create dynamic collections. It means that the objects in the collection can be loaded depending on the entered data or calculated values by the formula, unlike regular back reference with search only by key attributes.

Example

For example in the develop-and-test project there are two classes:

• `` searchRefs`` has the string attribute `` code_binding ‘’ added as a back reference for the binding.

  {
    "orderNumber": 30,
    "name": "code_binding",
    "caption": "Код для binding",
    "type": 0,
    "size": null,
    "decimals": 0,
    "allowedFileTypes": null,
    "maxFileCount": 0,
    "nullable": true,
    "readonly": false,
    "indexed": true,
    "unique": false,
    "autoassigned": false,
    "hint": null,
    "defaultValue": null,
    "refClass": "",
    "itemsClass": null,
    "backRef": null,
    "backColl": "",
    "binding": "",
    "semantic": "",
  "selConditions": null,
    "selSorting": [],
    "selectionProvider": null,
    "indexSearch": false,
    "eagerLoading": false,
    "formula": null
  }
  

• In the backref_searchRefs class the backref_searchRefs_binding and backref_searchRefs_text attributes are used. backref_searchRefs_binding is a dynamic collection, and the backref_searchRefs_text is used as a filter for the backref_searchRefs_binding collection. In the backref_searchRefs_binding collection the selection is occured by the equality of backref_searchRefs_text values from the backref_searchRefs class and code_binding values from the searchRefs class. When adding objects to the collection manually, the code_binding attribute is automatically filled.

{
  "orderNumber": 25,
  "name": "backref_searchRefs_binding",
  "caption": "Обратная ссылка (с подключенным binding) на класс searchRefs",
  "type": 14,
  "size": null,
  "decimals": 0,
  "allowedFileTypes": null,
  "maxFileCount": 0,
  "nullable": true,
  "readonly": false,
  "indexed": false,
  "unique": false,
  "autoassigned": false,
  "hint": null,
  "defaultValue": null,
  "refClass": "",
  "itemsClass": "searchRefs",
  "backRef": "code_binding",
  "backColl": "",
  "binding": "backref_searchRefs_text",
  "semantic": null,
"selConditions": null,
  "selSorting": [],
  "selectionProvider": null,
  "indexSearch": false,
  "eagerLoading": false,
  "formula": null
},
{
  "orderNumber": 30,
  "name": "backref_searchRefs_text",
  "caption": "Значение",
  "type": 0,
  "size": null,
  "decimals": 0,
  "allowedFileTypes": null,
  "maxFileCount": 0,
  "nullable": true,
  "readonly": false,
  "indexed": true,
  "unique": false,
  "autoassigned": false,
  "hint": null,
  "defaultValue": null,
  "refClass": "",
  "itemsClass": "",
  "backRef": "",
  "backColl": "",
  "binding": "",
  "semantic": null,
"selConditions": null,
  "selSorting": [],
  "selectionProvider": null,
  "indexSearch": false,
  "eagerLoading": false,
  "formula": null
}

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