<a href="https://docs.datasette.io/en/1.0a13/plugin_hooks.html#get-metadata-datasette-

Here's where it's called: <div class="Box-

And here's that `_metadata_recursive_update() method: <div class

get_metadata() plugin hook should support async await_me_maybe pattern about datasette HOT 2 OPEN

simonw commented on June 4, 2024

get_metadata() plugin hook should support async await_me_maybe pattern

from datasette.

Comments (2)

simonw commented on June 4, 2024

Here's where it's called:

datasette/datasette/app.py

Lines 649 to 695 in 8f9509f

 def metadata(self, key=None, database=None, table=None, fallback=True): 

 """ 

  Looks up metadata, cascading backwards from specified level. 

  Returns None if metadata value is not found. 

  """ 

 assert not ( 

 database is None and table is not None 

 ), "Cannot call metadata() with table= specified but not database=" 

 metadata = {} 

 for hook_dbs in pm.hook.get_metadata( 

 datasette=self, key=key, database=database, table=table 

 ): 

 metadata = self._metadata_recursive_update(metadata, hook_dbs) 

 # security precaution!! don't allow anything in the local config 

 # to be overwritten. this is a temporary measure, not sure if this 

 # is a good idea long term or maybe if it should just be a concern 

 # of the plugin's implemtnation 

 metadata = self._metadata_recursive_update(metadata, self._metadata_local) 

 databases = metadata.get("databases") or {} 

 search_list = [] 

 if database is not None: 

 search_list.append(databases.get(database) or {}) 

 if table is not None: 

 table_metadata = ((databases.get(database) or {}).get("tables") or {}).get( 

 table 

 ) or {} 

 search_list.insert(0, table_metadata) 

 search_list.append(metadata) 

 if not fallback: 

 # No fallback allowed, so just use the first one in the list 

 search_list = search_list[:1] 

 if key is not None: 

 for item in search_list: 

 if key in item: 

 return item[key] 

 return None 

 else: 

 # Return the merged list 

 m = {} 

 for item in search_list: 

 m.update(item) 

 return m

from datasette.

simonw commented on June 4, 2024

And here's that `_metadata_recursive_update() method:

datasette/datasette/app.py

Lines 638 to 647 in 8f9509f

 def _metadata_recursive_update(self, orig, updated): 

 if not isinstance(orig, dict) or not isinstance(updated, dict): 

 return orig 

 for key, upd_value in updated.items(): 

 if isinstance(upd_value, dict) and isinstance(orig.get(key), dict): 

 orig[key] = self._metadata_recursive_update(orig[key], upd_value) 

 else: 

 orig[key] = upd_value 

 return orig

from datasette.

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	def metadata(self, key=None, database=None, table=None, fallback=True):
	"""
	Looks up metadata, cascading backwards from specified level.
	Returns None if metadata value is not found.
	"""
	assert not (
	database is None and table is not None
	), "Cannot call metadata() with table= specified but not database="
	metadata = {}

	for hook_dbs in pm.hook.get_metadata(
	datasette=self, key=key, database=database, table=table
	):
	metadata = self._metadata_recursive_update(metadata, hook_dbs)

	# security precaution!! don't allow anything in the local config
	# to be overwritten. this is a temporary measure, not sure if this
	# is a good idea long term or maybe if it should just be a concern
	# of the plugin's implemtnation
	metadata = self._metadata_recursive_update(metadata, self._metadata_local)

	databases = metadata.get("databases") or {}

	search_list = []
	if database is not None:
	search_list.append(databases.get(database) or {})
	if table is not None:
	table_metadata = ((databases.get(database) or {}).get("tables") or {}).get(
	table
	) or {}
	search_list.insert(0, table_metadata)

	search_list.append(metadata)
	if not fallback:
	# No fallback allowed, so just use the first one in the list
	search_list = search_list[:1]
	if key is not None:
	for item in search_list:
	if key in item:
	return item[key]
	return None
	else:
	# Return the merged list
	m = {}
	for item in search_list:
	m.update(item)
	return m

	def _metadata_recursive_update(self, orig, updated):
	if not isinstance(orig, dict) or not isinstance(updated, dict):
	return orig

	for key, upd_value in updated.items():
	if isinstance(upd_value, dict) and isinstance(orig.get(key), dict):
	orig[key] = self._metadata_recursive_update(orig[key], upd_value)
	else:
	orig[key] = upd_value
	return orig

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