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title: Query sidebar_label: Query

Queries are exposed by the platform in the form of :queries key in the capacities map. Only those queries which are exposed can be either referenced by hook property (when the property is of the type :query), or used to read data in let block in view .

Query as hook property

To refer to some query via hook property (might be required for some host app hooks), the property must be defined as :query type by the app-hook and extension must correctly refer to query from capacities map.

Example

;; Capacities map in the host application
{:capacities {:queries {'network-up ...}}}

;; Extension hook data
hooks/wallet-asset.next-coin
{:able-to-send [network-up]}

Queries in views

To use some queries in extension defined view, the query must be exposed via capacities map of the host platform.

Example

;; Capacities map in the host application
{:capacities {:queries {'store/get ...}}}

;; Extension view data
views/coin-item
[view {}
  (let [current-network [store/get {:networks :current}]]
    [text {} "Current network: "]
      [text {} current-network]])