Make config raise specific domain specific error

.github/workflows/test.yml

@@ -64,6 +64,12 @@ jobs:
           otp: "19.3"
         - elixir: "1.11"
           otp: "20.0"
+        - elixir: "1.9"
+          otp: "23.0"
+        - elixir: "1.7"
+          otp: "23.0"
+        - elixir: "1.8"
+          otp: "23.0"
 
     steps:
     - name: Checkout

lib/paginator.ex

@@ -207,7 +207,11 @@ defmodule Paginator do
       iex> Paginator.cursor_for_record(%Paginator.Customer{id: 1, name: "Alice"}, [id: :asc, name: :desc])
       "g3QAAAACZAACaWRhAWQABG5hbWVtAAAABUFsaWNl"
   """
-  @spec cursor_for_record(any(), [atom() | {atom(), atom()}], (map(), atom() | {atom(), atom()} -> any())) :: binary()
+  @spec cursor_for_record(
+          any(),
+          [atom() | {atom(), atom()}],
+          (map(), atom() | {atom(), atom()} -> any())
+        ) :: binary()
   def cursor_for_record(
         record,
         cursor_fields,

lib/paginator/config.ex

@@ -20,6 +20,10 @@ defmodule Paginator.Config do
     :total_count_limit
   ]
 
+  defmodule ArgumentError do
+    defexception [:message]
+  end
+
   @default_total_count_primary_key_field :id
   @default_limit 50
   @minimum_limit 1
@@ -55,15 +59,19 @@ defmodule Paginator.Config do
 
   def validate!(%__MODULE__{} = config) do
     unless config.cursor_fields do
-      raise(ArgumentError, "expected `:cursor_fields` to be set")
+      raise(Paginator.Config.ArgumentError, message: "expected `:cursor_fields` to be set")
     end
 
     if !cursor_values_match_cursor_fields?(config.after_values, config.cursor_fields) do
-      raise(ArgumentError, message: "expected `:after` cursor to match `:cursor_fields`")
+      raise(Paginator.Config.ArgumentError,
+        message: "expected `:after` cursor to match `:cursor_fields`"
+      )
     end
 
     if !cursor_values_match_cursor_fields?(config.before_values, config.cursor_fields) do
-      raise(ArgumentError, message: "expected `:before` cursor to match `:cursor_fields`")
+      raise(Paginator.Config.ArgumentError,
+        message: "expected `:before` cursor to match `:cursor_fields`"
+      )
     end
   end
 

test/paginator/config_test.exs

@@ -120,17 +120,19 @@ defmodule Paginator.ConfigTest do
     test "raises ArgumentError when cursor_fields are not set" do
       config = Config.new([])
 
-      assert_raise ArgumentError, "expected `:cursor_fields` to be set", fn ->
+      assert_raise Config.ArgumentError, "expected `:cursor_fields` to be set", fn ->
         Config.validate!(config)
       end
     end
 
     test "raises ArgumentError when after cursor does not match the cursor_fields" do
       config = Config.new(cursor_fields: [:date], after: complex_after())
 
-      assert_raise ArgumentError, "expected `:after` cursor to match `:cursor_fields`", fn ->
-        Config.validate!(config)
-      end
+      assert_raise Config.ArgumentError,
+                   "expected `:after` cursor to match `:cursor_fields`",
+                   fn ->
+                     Config.validate!(config)
+                   end
     end
 
     test "raises ArgumentError when after cursor does not match cursor_fields with schema" do
@@ -144,9 +146,11 @@ defmodule Paginator.ConfigTest do
             })
         )
 
-      assert_raise ArgumentError, "expected `:after` cursor to match `:cursor_fields`", fn ->
-        Config.validate!(config)
-      end
+      assert_raise Config.ArgumentError,
+                   "expected `:after` cursor to match `:cursor_fields`",
+                   fn ->
+                     Config.validate!(config)
+                   end
     end
 
     test "ok when after cursor matches cursor_fields with schema" do
@@ -166,9 +170,11 @@ defmodule Paginator.ConfigTest do
     test "raises ArgumentError when before cursor does not match the cursor_fields" do
       config = Config.new(cursor_fields: [:id], before: complex_before())
 
-      assert_raise ArgumentError, "expected `:before` cursor to match `:cursor_fields`", fn ->
-        Config.validate!(config)
-      end
+      assert_raise Config.ArgumentError,
+                   "expected `:before` cursor to match `:cursor_fields`",
+                   fn ->
+                     Config.validate!(config)
+                   end
     end
   end
 

test/paginator_test.exs

@@ -970,9 +970,7 @@ defmodule PaginatorTest do
   end
 
   for field0_order <- @available_sorting_order, field1_order <- @available_sorting_order do
-    test "paginates correctly when pages contains nulls - order by charged_at #{field0_order}, id #{
-           field1_order
-         }" do
+    test "paginates correctly when pages contains nulls - order by charged_at #{field0_order}, id #{field1_order}" do
       customer = insert(:customer)
 
       now = NaiveDateTime.utc_now()