Select fields

CHANGELOG.md

@@ -1,5 +1,9 @@
 # CHANGELOG
 
+## v0.5.0
+
+* Added support for `:select` query option, to select specific fields from the database.
+
 ## v0.4.0
 
 * Added support for `new_#{record}` function

README.md

@@ -12,7 +12,7 @@ Add `context_kit` to your list of dependencies in `mix.exs`:
 
     def deps do
       [
-        {:context_kit, "~> 0.4.0"}
+        {:context_kit, "~> 0.5.0"}
       ]
     end
 

lib/context_kit/query.ex

@@ -63,6 +63,7 @@ defmodule ContextKit.Query do
     - `:limit` - Limit number of results
     - `:preload` - Preload associations
     - `:paginate` - Enable pagination with optional configuration
+    - `:select` - Select only specific fields from the database
   """
 
   import Ecto.Query
@@ -75,7 +76,8 @@ defmodule ContextKit.Query do
     :limit,
     :order_by,
     :paginate,
-    :preload
+    :preload,
+    :select
   ]
 
   def new(schema) do
@@ -321,6 +323,10 @@ defmodule ContextKit.Query do
     limit(query, ^limit)
   end
 
+  defp apply_query_option({:select, fields}, query, _binding_name) do
+    select(query, ^fields)
+  end
+
   defp apply_query_option({:preload, preload}, query, _binding_name) do
     preload(query, ^preload)
   end

mix.exs

@@ -1,7 +1,7 @@
 defmodule ContextKit.MixProject do
   use Mix.Project
 
-  @version "0.4.0"
+  @version "0.5.0"
   @source_url "https://github.com/egze/context_kit"
 
   def project do

test/context_kit/crud/scoped_test.exs

@@ -107,7 +107,17 @@ defmodule ContextKit.CRUD.ScopedTest do
 
       assert [db_book] = ScopedBooks.list_scoped_books()
 
+      assert db_book.id == scoped_book.id
+      assert db_book.title == "My Book"
+    end
+
+    test "selects specific fields" do
+      assert {:ok, scoped_book} = Repo.insert(%ScopedBook{title: "My Book"})
+
+      assert [db_book] = ScopedBooks.list_scoped_books(select: [:id])
+
       assert scoped_book.id == db_book.id
+      assert db_book.title == nil
     end
 
     test "filters by scope" do

test/context_kit/crud_test.exs

@@ -54,7 +54,17 @@ defmodule ContextKit.CRUDTest do
 
       assert [db_book] = Books.list_books()
 
-      assert book.id == db_book.id
+      assert db_book.id == book.id
+      assert db_book.title == "My Book"
+    end
+
+    test "selects specific fields" do
+      assert {:ok, scoped_book} = Repo.insert(%Book{title: "My Book"})
+
+      assert [db_book] = Books.list_books(select: [:id])
+
+      assert scoped_book.id == db_book.id
+      assert db_book.title == nil
     end
 
     test "filters by fields in keyword list" do