Add API for CRUD actions on steps

app/controllers/cards/steps_controller.rb

@@ -5,6 +5,11 @@ class Cards::StepsController < ApplicationController
 
   def create
     @step = @card.steps.create!(step_params)
+
+    respond_to do |format|
+      format.turbo_stream
+      format.json { head :created, location: card_step_path(@card, @step, format: :json) }
+    end
   end
 
   def show
@@ -15,10 +20,20 @@ class Cards::StepsController < ApplicationController
 
   def update
     @step.update!(step_params)
+
+    respond_to do |format|
+      format.turbo_stream
+      format.json { render :show }
+    end
   end
 
   def destroy
     @step.destroy!
+
+    respond_to do |format|
+      format.turbo_stream
+      format.json { head :no_content }
+    end
   end
 
   private

app/views/cards/steps/_step.json.jbuilder

@@ -0,0 +1 @@
+json.(step, :id, :content, :completed)

app/views/cards/steps/show.json.jbuilder

@@ -0,0 +1 @@
+json.partial! "cards/steps/step", step: @step

test/controllers/cards/steps_controller_test.rb

@@ -52,4 +52,47 @@ class Cards::StepsControllerTest < ActionDispatch::IntegrationTest
       assert_turbo_stream action: :replace, target: dom_id(step)
     end
   end
+
+  test "create as JSON" do
+    card = cards(:logo)
+
+    assert_difference -> { card.steps.count }, +1 do
+      post card_steps_path(card), params: { step: { content: "New step" } }, as: :json
+    end
+
+    assert_response :created
+    assert_equal card_step_path(card, Step.last, format: :json), @response.headers["Location"]
+  end
+
+  test "show as JSON" do
+    card = cards(:logo)
+    step = card.steps.create!(content: "Test step")
+
+    get card_step_path(card, step), as: :json
+
+    assert_response :success
+    assert_equal step.id, @response.parsed_body["id"]
+    assert_equal "Test step", @response.parsed_body["content"]
+  end
+
+  test "update as JSON" do
+    card = cards(:logo)
+    step = card.steps.create!(content: "Original")
+
+    put card_step_path(card, step), params: { step: { content: "Updated" } }, as: :json
+
+    assert_response :success
+    assert_equal "Updated", step.reload.content
+    assert_equal "Updated", @response.parsed_body["content"]
+  end
+
+  test "destroy as JSON" do
+    card = cards(:logo)
+    step = card.steps.create!(content: "To delete")
+
+    delete card_step_path(card, step), as: :json
+
+    assert_response :no_content
+    assert_not Step.exists?(step.id)
+  end
 end