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-rw-r--r--activerecord/lib/active_record/connection_adapters/connection_specification.rb21
1 files changed, 20 insertions, 1 deletions
diff --git a/activerecord/lib/active_record/connection_adapters/connection_specification.rb b/activerecord/lib/active_record/connection_adapters/connection_specification.rb
index f60d8469cc..9eaf9d9a89 100644
--- a/activerecord/lib/active_record/connection_adapters/connection_specification.rb
+++ b/activerecord/lib/active_record/connection_adapters/connection_specification.rb
@@ -248,10 +248,29 @@ module ActiveRecord
if db_config
resolve_connection(db_config.config).merge("name" => pool_name.to_s)
else
- raise(AdapterNotSpecified, "'#{env_name}' database is not configured. Available: #{configurations.configurations.map(&:env_name).join(", ")}")
+ raise AdapterNotSpecified, <<~MSG
+ The `#{env_name}` database is not configured for the `#{ActiveRecord::ConnectionHandling::DEFAULT_ENV.call}` environment.
+
+ Available databases configurations are:
+
+ #{build_configuration_sentence}
+ MSG
end
end
+ def build_configuration_sentence # :nodoc:
+ configs = configurations.configs_for(include_replicas: true)
+
+ configs.group_by(&:env_name).map do |env, config|
+ namespaces = config.map(&:spec_name)
+ if namespaces.size > 1
+ "#{env}: #{namespaces.join(", ")}"
+ else
+ env
+ end
+ end.join("\n")
+ end
+
# Accepts a hash. Expands the "url" key that contains a
# URL database connection to a full connection
# hash and merges with the rest of the hash.