Rename After & Before School Care category and update subcategories. (#754)

For the Our415 project, we are dropping "Care" from the name of the
category, and we are adding it as a subcategory of several other
top-level categories.

Author: richardxia

db/migrate/20250130044205_update_after_and_before_school_care_category.rb

@@ -0,0 +1,61 @@
+class UpdateAfterAndBeforeSchoolCareCategory < ActiveRecord::Migration[6.1]
+  def up
+    ActiveRecord::Base.transaction do
+      # Set this to true to enable assertions
+      @assertions_enabled = true
+
+      rename_category from: 'After & Before School Care', to: 'After & Before School'
+
+      create_subcategory_relationship('Arts, Culture & Identity', 'After & Before School')
+      create_subcategory_relationship("Education", 'After & Before School')
+      create_subcategory_relationship("Sports & Recreation", 'After & Before School')
+      create_subcategory_relationship("Youth Workforce & Life Skills", 'After & Before School')
+    end
+  end
+
+  def down
+    raise ActiveRecord::IrreversibleMigration
+  end
+
+  private
+
+  def rename_category(from:, to:)
+    assert_category_exists from
+    assert_category_does_not_exist to
+
+    exec_query <<-SQL, "rename category from #{from} to #{to}", [to, from]
+      UPDATE categories
+        SET name = $1
+        WHERE name = $2;
+    SQL
+  end
+
+  def assert_category_exists(name)
+    return unless @assertions_enabled
+
+    count = select_value("SELECT COUNT(*) FROM categories WHERE name = $1", "count category #{name}", [name])
+    raise "Expected category #{name} to exist, got #{count} results" unless count == 1
+  end
+
+  def assert_category_does_not_exist(name)
+    return unless @assertions_enabled
+
+    count = select_value("SELECT COUNT(*) FROM categories WHERE name = $1", "count category #{name}", [name])
+    raise "Expected category #{name} to not exist, got #{count} results" unless count == 0
+  end
+
+  def category_id(name)
+    id = select_value("SELECT id FROM categories WHERE name = $1", "get category id #{name}", [name])
+    raise "Category #{name} does not exist" if id.nil?
+    id
+  end
+
+  def create_subcategory_relationship(top_category, subcategory)
+    top_category_id = category_id(top_category)
+    subcategory_id = category_id(subcategory)
+    exec_query <<-SQL, "create subcategory relationship #{top_category} -> #{subcategory}", [top_category_id, subcategory_id]
+      INSERT INTO category_relationships (parent_id, child_id)
+        VALUES ($1, $2);
+    SQL
+  end
+end

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 2024_10_17_030157) do
+ActiveRecord::Schema.define(version: 2025_01_30_044205) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"