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# Google Cloud Datastore Emulator To develop and test your application locally, you can use the [Google Cloud Datastore Emulator](https://cloud.google.com/datastore/docs/tools/datastore-emulator), which provides [local emulation](https://cloud.google.com/sdk/gcloud/reference/beta/emulators/) of the production Google Cloud Datastore environment. You can start the Google Cloud Datastore emulator using the `gcloud` command-line tool. When you run the Cloud Datastore emulator you will see a message similar to the following printed: ``` If you are using a library that supports the DATASTORE_EMULATOR_HOST environment variable, run: export DATASTORE_EMULATOR_HOST=localhost:8978 ``` Now you can connect to the emulator using the `DATASTORE_EMULATOR_HOST` environment variable: ```ruby require "google/cloud/datastore" # Make Datastore use the emulator ENV["DATASTORE_EMULATOR_HOST"] = "localhost:8978" datastore = Google::Cloud::Datastore.new project: "emulator-project-id" task = datastore.entity "Task", "emulatorTask" do |t| t["type"] = "Testing" t["done"] = false t["priority"] = 5 t["description"] = "Use Datastore Emulator" end datastore.save task ``` Or by providing the `emulator_host` argument: ```ruby require "google/cloud/datastore" datastore = Google::Cloud::Datastore.new emulator_host: "localhost:8978" task = datastore.entity "Task", "emulatorTask" do |t| t["type"] = "Testing" t["done"] = false t["priority"] = 5 t["description"] = "Use Datastore Emulator" end datastore.save task ```
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33 entries across 33 versions & 1 rubygems