fix: Update database connection handling and configuration for appliance environment

Author: maboukerfa

config/database.yml

@@ -19,10 +19,10 @@ test:
   username: <%= ENV.fetch("DATABASE_USER", "ontoportal") %>
   password: <%= ENV.fetch("DATABASE_PASSWORD", "ontoportal") %>
 
-production:
+appliance:
   <<: *default
-  host: <%= ENV["DATABASE_HOST"] %>
+  host: <%= ENV.fetch("DATABASE_HOST", "localhost") %>
   port: <%= ENV.fetch("DATABASE_PORT", 5432) %>
-  database: <%= ENV["DATABASE_NAME"] %>
-  username: <%= ENV["DATABASE_USER"] %>
-  password: <%= ENV["DATABASE_PASSWORD"] %>
+  database: <%= ENV.fetch("DATABASE_NAME", "ontologies_api_appliance") %>
+  username: <%= ENV.fetch("DATABASE_USER", "ontoportal") %>
+  password: <%= ENV.fetch("DATABASE_PASSWORD", "ontoportal") %>

config/relationalDatabase.rb

@@ -5,8 +5,19 @@
 module RelationalDatabase
   class << self
     def connect!
-      ActiveRecord::Base.establish_connection(load_config[environment])
-      puts "(API) >> Connected to PostgreSQL database: #{ActiveRecord::Base.connection_db_config.database}"
+      env = environment
+      config = load_config
+      
+      ActiveRecord::Base.configurations = config
+      
+      begin
+        ActiveRecord::Base.establish_connection(env.to_sym)
+        puts "(API) >> Connected to PostgreSQL database: #{ActiveRecord::Base.connection_db_config.database} (env: #{env})"
+      rescue => e
+        puts "(API) >> ERROR: Failed to connect to database for env '#{env}': #{e.message}"
+        puts "(API) >> Available configs: #{ActiveRecord::Base.configurations.configs_for.map(&:env_name).inspect}"
+        raise e
+      end
     end
 
     def create!
@@ -34,10 +45,12 @@ def config_file
     private
 
     def load_config
-      @load_config ||= YAML.safe_load(
-        ERB.new(File.read(config_file)).result,
-        aliases: true
-      )
+      @load_config ||= begin
+        YAML.safe_load(
+          ERB.new(File.read(config_file)).result,
+          aliases: true
+        )
+      end
     end
 
     def environment

config/unicorn.rb

@@ -75,7 +75,7 @@
   # Unix forking works, we need to make sure we aren't using any of the parent's
   # sockets, e.g. db connection
 
-  defined?(ActiveRecord::Base) and ActiveRecord::Base.establish_connection
+  defined?(ActiveRecord::Base) and RelationalDatabase.connect!
   # Redis and Memcached would go here but their connections are established
   # on demand, so the master never opens a socket
 end