feat: Add APIs to create custom views on the dashboard (#2498)

app/controllers/api/v1/accounts/custom_filters_controller.rb

@@ -0,0 +1,50 @@
+class Api::V1::Accounts::CustomFiltersController < Api::V1::Accounts::BaseController
+  protect_from_forgery with: :null_session
+  before_action :fetch_custom_filters, except: [:create]
+  before_action :fetch_custom_filter, only: [:show, :update, :destroy]
+  DEFAULT_FILTER_TYPE = 'conversation'.freeze
+
+  def index; end
+
+  def show; end
+
+  def create
+    @custom_filter = current_user.custom_filters.create!(
+      permitted_payload.merge(account_id: Current.account.id)
+    )
+  end
+
+  def update
+    @custom_filter.update!(permitted_payload)
+  end
+
+  def destroy
+    @custom_filter.destroy
+    head :no_content
+  end
+
+  private
+
+  def fetch_custom_filters
+    @custom_filters = current_user.custom_filters.where(
+      account_id: Current.account.id,
+      filter_type: permitted_params[:filter_type] || DEFAULT_FILTER_TYPE
+    )
+  end
+
+  def fetch_custom_filter
+    @custom_filter = @custom_filters.find(permitted_params[:id])
+  end
+
+  def permitted_payload
+    params.require(:custom_filter).permit(
+      :name,
+      :filter_type,
+      query: {}
+    )
+  end
+
+  def permitted_params
+    params.permit(:id, :filter_type)
+  end
+end