END-013 - Expose is_nullable on Endo.Column.t()

lib/endo/adapters/postgres.ex

@@ -84,6 +84,7 @@ defmodule Endo.Adapters.Postgres do
       position: column.ordinal_position,
       default_value: column.column_default,
       type: column.udt_name,
+      is_nullable: column.is_nullable == :yes,
       type_metadata: Type.Metadata.derive!(column)
     }
   end

lib/endo/column.ex

@@ -8,6 +8,7 @@ defmodule Endo.Column do
     :name,
     :type,
     :position,
+    :is_nullable,
     :type_metadata,
     :default_value,
     :table_name,

priv/repo/migrations/20221221123643_bootstrap_testing_env.exs

@@ -23,8 +23,8 @@ defmodule Test.Postgres.Repo.Migrations.BootstrapTestingEnv do
 
   defp create_accounts do
     create table(:accounts) do
-      add(:username, :string, null: false)
-      add(:email, :string, null: false)
+      add(:username, :string, null: true)
+      add(:email, :string, null: true)
 
       timestamps()
     end
@@ -63,7 +63,7 @@ defmodule Test.Postgres.Repo.Migrations.BootstrapTestingEnv do
 
     create table(:accounts_orgs, primary_key: false) do
       add(:account_id, references(:accounts), null: false)
-      add(:org_id, references(:orgs), null: false)
+      add(:org_id, references(:orgs), null: true)
 
       timestamps()
     end

test/endo_test.exs

@@ -488,6 +488,18 @@ defmodule EndoTest do
       assert %Endo.Column{indexes: []} = Enum.find(repos.columns, &(&1.name == "some_interval"))
     end
 
+    test "given a single table, returns whether columns are nullable" do
+      accounts_orgs = Endo.get_table(Test.Postgres.Repo, "accounts_orgs")
+
+      assert length(accounts_orgs.columns) == 2
+
+      org_id = Enum.find(accounts_orgs.columns, &(&1.name == "org_id"))
+      account_id = Enum.find(accounts_orgs.columns, &(&1.name == "account_id"))
+
+      assert org_id.is_nullable
+      refute account_id.is_nullable
+    end
+
     test "given a single table, fetches all indexes for each column" do
       repos = Endo.get_table(Test.Postgres.Repo, "repos")