Add Classifications and Resource validations

- Turn `has_and_belongs_to_many` into `has_many :through`: now,
resources and sections are related through Classifications.
- Refactor usage of jsonb column to use ActiveRecord validations
- Attention! store_accessor:

NOTE: If you are using structured database data types (eg. PostgreSQL hstore/json, or MySQL 5.7+ json) there is no need for the
serialization provided by .store. Simply use .store_accessor instead to generate the accessor methods. Be aware that these
columns use a string keyed hash and do not allow access using a symbol.

NOTE: The default validations with the exception of uniqueness will work. For example, if you want to check for uniqueness with
hstore you will need to use a custom validation to handle it.

https://api.rubyonrails.org/classes/ActiveRecord/Store.html

3 files changed, 43 insertions, 7 deletions

diff --git a/db/migrate/20201009025353_add_default_to_resource_feature.rb b/db/migrate/20201009025353_add_default_to_resource_feature.rb
new file mode 100644
index 0000000..06cad6c
--- /dev/null
+++ b/db/migrate/20201009025353_add_default_to_resource_feature.rb
@@ -0,0 +1,30 @@
+class AddDefaultToResourceFeature < ActiveRecord::Migration[6.0]
+  def up
+    change_column_default :resources, :feature,
+                          {
+                            "geometry": {
+                                          "type": "Point",
+                                          "coordinates": [0,0]
+                                        },
+                            "properties": {
+                                            "name":"",
+                                            "description":"",
+                                            "address":"",
+                                            "postal_code":"",
+                                            "city":"",
+                                            "email":"",
+                                            "phone_number":"",
+                                            "website":"",
+                                            "categories":[],
+                                            "source":"incommon",
+                                            "entry_number":nil,
+                                            "srid":4326
+                                         }
+                          }
+    add_index :resources, :feature, using: :gin
+  end
+  def down
+    change_column_default :resources, :feature, nil
+    remove_index :resources, :feature
+  end
+end
diff --git a/db/migrate/20201009061548_rename_resources_sections_to_classifications.rb b/db/migrate/20201009061548_rename_resources_sections_to_classifications.rb
new file mode 100644
index 0000000..4f7972b
--- /dev/null
+++ b/db/migrate/20201009061548_rename_resources_sections_to_classifications.rb
@@ -0,0 +1,5 @@
+class RenameResourcesSectionsToClassifications < ActiveRecord::Migration[6.0]
+  def change
+    rename_table :resources_sections, :classifications
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index 16ba65c..0660ef9 100644
--- a/db/schema.rb
+++ b/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: 2020_10_08_190558) do
+ActiveRecord::Schema.define(version: 2020_10_09_061548) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -50,21 +50,22 @@ ActiveRecord::Schema.define(version: 2020_10_08_190558) do
     t.index ["taxonomy_id"], name: "index_categories_on_taxonomy_id"
   end
 
+  create_table "classifications", id: false, force: :cascade do |t|
+    t.bigint "resource_id", null: false
+    t.bigint "section_id", null: false
+  end
+
   create_table "resources", force: :cascade do |t|
     t.uuid "uuid"
-    t.jsonb "feature"
+    t.jsonb "feature", default: {"geometry"=>{"type"=>"Point", "coordinates"=>[0, 0]}, "properties"=>{"city"=>"", "name"=>"", "srid"=>4326, "email"=>"", "source"=>"incommon", "address"=>"", "website"=>"", "categories"=>[], "description"=>"", "postal_code"=>"", "entry_number"=>nil, "phone_number"=>""}}
     t.bigint "agent_id", null: false
     t.datetime "created_at", precision: 6, null: false
     t.datetime "updated_at", precision: 6, null: false
     t.index ["agent_id"], name: "index_resources_on_agent_id"
+    t.index ["feature"], name: "index_resources_on_feature", using: :gin
     t.index ["uuid"], name: "index_resources_on_uuid", unique: true
   end
 
-  create_table "resources_sections", id: false, force: :cascade do |t|
-    t.bigint "resource_id", null: false
-    t.bigint "section_id", null: false
-  end
-
   create_table "sections", force: :cascade do |t|
     t.string "name", limit: 64
     t.string "summary", limit: 136