Add #count

spec/granite_orm/querying/count_spec.cr

@@ -0,0 +1,22 @@
+require "../../spec_helper"
+
+{% for adapter in GraniteExample::ADAPTERS %}
+  {% model_constant = "Parent#{adapter.camelcase.id}".id %}
+
+  describe "{{ adapter.id }} #count" do
+    it "returns 0 if no result" do
+      count = {{ model_constant }}.count
+      count.should eq 0
+    end
+
+    it "returns a number of the all records for the model" do
+      2.times do |i|
+        {{ model_constant }}.new(name: "model_#{i}").tap(&.save)
+      end
+
+      count = {{ model_constant }}.count
+      count.should eq 2
+    end
+  end
+
+{% end %}

src/granite_orm/querying.cr

@@ -92,6 +92,11 @@ module Granite::ORM::Querying
     end
   end
 
+  # count returns a count of all the records
+  def count : Int64
+    scalar "select count(*) from #{@@table_name}", &.to_s.to_i64
+  end
+
   def exec(clause = "")
     @@adapter.open { |db| db.exec(clause) }
   end