保留查询

为了手动保留查询，以使它引用的数据不被 Relay 回收，我们可以使用 environment.retain 方法

const {
  createOperationDescriptor,
  getRequest,
  graphql,
} = require('relay-runtime')

// Query graphql object
const query = graphql`...`;

// Construct Relay's internal representation of the query
const queryRequest = getRequest(query);
const queryDescriptor = createOperationDescriptor(
  queryRequest,
  variables
);

// Retain query; this will prevent the data for this query and
// variables from being garbage collected by Relay
const disposable = environment.retain(queryDescriptor);

// Disposing of the disposable will release the data for this query
// and variables, meaning that it can be deleted at any moment
// by Relay's garbage collection if it hasn't been retained elsewhere
disposable.dispose();

注意

Relay 会根据任何渲染数据的已挂载查询组件自动管理查询数据保留，因此通常您不需要在产品代码中直接调用 retain。对于任何高级或特殊用例，查询数据保留通常应该在基础设施级别代码中处理，例如路由器。

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