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models.py
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models.py
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"""A collection of ORM sqlalchemy models for Caravel"""
from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
from __future__ import unicode_literals
import functools
import json
import logging
import pickle
import re
import textwrap
from collections import namedtuple
from copy import deepcopy, copy
from datetime import timedelta, datetime, date
import humanize
import pandas as pd
import requests
import sqlalchemy as sqla
from sqlalchemy.engine.url import make_url
from sqlalchemy.orm import subqueryload
import sqlparse
from dateutil.parser import parse
from flask import escape, g, Markup, request
from flask_appbuilder import Model
from flask_appbuilder.models.mixins import AuditMixin
from flask_appbuilder.models.decorators import renders
from flask_babel import lazy_gettext as _
from pydruid.client import PyDruid
from pydruid.utils.filters import Dimension, Filter
from pydruid.utils.postaggregator import Postaggregator
from pydruid.utils.having import Aggregation
from six import string_types
from sqlalchemy import (
Column, Integer, String, ForeignKey, Text, Boolean,
DateTime, Date, Table, Numeric,
create_engine, MetaData, desc, asc, select, and_, func
)
from sqlalchemy.ext.compiler import compiles
from sqlalchemy.ext.declarative import declared_attr
from sqlalchemy.orm import backref, relationship
from sqlalchemy.orm.session import make_transient
from sqlalchemy.sql import table, literal_column, text, column
from sqlalchemy.sql.expression import ColumnClause, TextAsFrom
from sqlalchemy_utils import EncryptedType
from werkzeug.datastructures import ImmutableMultiDict
import caravel
from caravel import app, db, db_engine_specs, get_session, utils, sm
from caravel.source_registry import SourceRegistry
from caravel.viz import viz_types
from caravel.utils import (
flasher, MetricPermException, DimSelector, wrap_clause_in_parens
)
config = app.config
QueryResult = namedtuple('namedtuple', ['df', 'query', 'duration'])
FillterPattern = re.compile(r'''((?:[^,"']|"[^"]*"|'[^']*')+)''')
class JavascriptPostAggregator(Postaggregator):
def __init__(self, name, field_names, function):
self.post_aggregator = {
'type': 'javascript',
'fieldNames': field_names,
'name': name,
'function': function,
}
self.name = name
class ImportMixin(object):
def override(self, obj):
"""Overrides the plain fields of the dashboard."""
for field in obj.__class__.export_fields:
setattr(self, field, getattr(obj, field))
def copy(self):
"""Creates a copy of the dashboard without relationships."""
new_obj = self.__class__()
new_obj.override(self)
return new_obj
def alter_params(self, **kwargs):
d = self.params_dict
d.update(kwargs)
self.params = json.dumps(d)
@property
def params_dict(self):
if self.params:
return json.loads(self.params)
else:
return {}
class AuditMixinNullable(AuditMixin):
"""Altering the AuditMixin to use nullable fields
Allows creating objects programmatically outside of CRUD
"""
created_on = Column(DateTime, default=datetime.now, nullable=True)
changed_on = Column(
DateTime, default=datetime.now,
onupdate=datetime.now, nullable=True)
@declared_attr
def created_by_fk(cls): # noqa
return Column(Integer, ForeignKey('ab_user.id'),
default=cls.get_user_id, nullable=True)
@declared_attr
def changed_by_fk(cls): # noqa
return Column(
Integer, ForeignKey('ab_user.id'),
default=cls.get_user_id, onupdate=cls.get_user_id, nullable=True)
@renders('created_on')
def creator(self): # noqa
return '{}'.format(self.created_by or '')
@property
def changed_by_(self):
return '{}'.format(self.changed_by or '')
@renders('changed_on')
def changed_on_(self):
return Markup(
'<span class="no-wrap">{}</span>'.format(self.changed_on))
@renders('changed_on')
def modified(self):
s = humanize.naturaltime(datetime.now() - self.changed_on)
return Markup('<span class="no-wrap">{}</span>'.format(s))
@property
def icons(self):
return """
<a
href="{self.datasource_edit_url}"
data-toggle="tooltip"
title="{self.datasource}">
<i class="fa fa-database"></i>
</a>
""".format(**locals())
class Url(Model, AuditMixinNullable):
"""Used for the short url feature"""
__tablename__ = 'url'
id = Column(Integer, primary_key=True)
url = Column(Text)
class CssTemplate(Model, AuditMixinNullable):
"""CSS templates for dashboards"""
__tablename__ = 'css_templates'
id = Column(Integer, primary_key=True)
template_name = Column(String(250))
css = Column(Text, default='')
slice_user = Table('slice_user', Model.metadata,
Column('id', Integer, primary_key=True),
Column('user_id', Integer, ForeignKey('ab_user.id')),
Column('slice_id', Integer, ForeignKey('slices.id'))
)
class Slice(Model, AuditMixinNullable, ImportMixin):
"""A slice is essentially a report or a view on data"""
__tablename__ = 'slices'
id = Column(Integer, primary_key=True)
slice_name = Column(String(250))
datasource_id = Column(Integer)
datasource_type = Column(String(200))
datasource_name = Column(String(2000))
viz_type = Column(String(250))
params = Column(Text)
description = Column(Text)
cache_timeout = Column(Integer)
perm = Column(String(2000))
owners = relationship("User", secondary=slice_user)
export_fields = ('slice_name', 'datasource_type', 'datasource_name',
'viz_type', 'params', 'cache_timeout')
def __repr__(self):
return self.slice_name
@property
def cls_model(self):
return SourceRegistry.sources[self.datasource_type]
@property
def datasource(self):
return self.get_datasource
@datasource.getter
@utils.memoized
def get_datasource(self):
ds = db.session.query(
self.cls_model).filter_by(
id=self.datasource_id).first()
return ds
@renders('datasource_name')
def datasource_link(self):
datasource = self.datasource
if datasource:
return self.datasource.link
@property
def datasource_edit_url(self):
self.datasource.url
@property
@utils.memoized
def viz(self):
d = json.loads(self.params)
viz_class = viz_types[self.viz_type]
return viz_class(self.datasource, form_data=d)
@property
def description_markeddown(self):
return utils.markdown(self.description)
@property
def data(self):
"""Data used to render slice in templates"""
d = {}
self.token = ''
try:
d = self.viz.data
self.token = d.get('token')
except Exception as e:
d['error'] = str(e)
d['slice_id'] = self.id
d['slice_name'] = self.slice_name
d['description'] = self.description
d['slice_url'] = self.slice_url
d['edit_url'] = self.edit_url
d['description_markeddown'] = self.description_markeddown
return d
@property
def json_data(self):
return json.dumps(self.data)
@property
def slice_url(self):
"""Defines the url to access the slice"""
try:
slice_params = json.loads(self.params)
except Exception as e:
logging.exception(e)
slice_params = {}
slice_params['slice_id'] = self.id
slice_params['json'] = "false"
slice_params['slice_name'] = self.slice_name
from werkzeug.urls import Href
href = Href(
"/caravel/explore/{obj.datasource_type}/"
"{obj.datasource_id}/".format(obj=self))
return href(slice_params)
@property
def slice_id_url(self):
return (
"/caravel/{slc.datasource_type}/{slc.datasource_id}/{slc.id}/"
).format(slc=self)
@property
def edit_url(self):
return "/slicemodelview/edit/{}".format(self.id)
@property
def slice_link(self):
url = self.slice_url
name = escape(self.slice_name)
return Markup('<a href="{url}">{name}</a>'.format(**locals()))
def get_viz(self, url_params_multidict=None):
"""Creates :py:class:viz.BaseViz object from the url_params_multidict.
:param werkzeug.datastructures.MultiDict url_params_multidict:
Contains the visualization params, they override the self.params
stored in the database
:return: object of the 'viz_type' type that is taken from the
url_params_multidict or self.params.
:rtype: :py:class:viz.BaseViz
"""
slice_params = json.loads(self.params) # {}
slice_params['slice_id'] = self.id
slice_params['json'] = "false"
slice_params['slice_name'] = self.slice_name
slice_params['viz_type'] = self.viz_type if self.viz_type else "table"
if url_params_multidict:
slice_params.update(url_params_multidict)
to_del = [k for k in slice_params if k not in url_params_multidict]
for k in to_del:
del slice_params[k]
immutable_slice_params = ImmutableMultiDict(slice_params)
return viz_types[immutable_slice_params.get('viz_type')](
self.datasource,
form_data=immutable_slice_params,
slice_=self
)
@classmethod
def import_obj(cls, slc_to_import, import_time=None):
"""Inserts or overrides slc in the database.
remote_id and import_time fields in params_dict are set to track the
slice origin and ensure correct overrides for multiple imports.
Slice.perm is used to find the datasources and connect them.
"""
session = db.session
make_transient(slc_to_import)
slc_to_import.dashboards = []
slc_to_import.alter_params(
remote_id=slc_to_import.id, import_time=import_time)
# find if the slice was already imported
slc_to_override = None
for slc in session.query(Slice).all():
if ('remote_id' in slc.params_dict and
slc.params_dict['remote_id'] == slc_to_import.id):
slc_to_override = slc
slc_to_import = slc_to_import.copy()
params = slc_to_import.params_dict
slc_to_import.datasource_id = SourceRegistry.get_datasource_by_name(
session, slc_to_import.datasource_type, params['datasource_name'],
params['schema'], params['database_name']).id
if slc_to_override:
slc_to_override.override(slc_to_import)
session.flush()
return slc_to_override.id
else:
session.add(slc_to_import)
logging.info('Final slice: {}'.format(slc_to_import.to_json()))
session.flush()
return slc_to_import.id
def set_perm(mapper, connection, target): # noqa
src_class = target.cls_model
id_ = target.datasource_id
ds = db.session.query(src_class).filter_by(id=int(id_)).first()
target.perm = ds.perm
sqla.event.listen(Slice, 'before_insert', set_perm)
sqla.event.listen(Slice, 'before_update', set_perm)
dashboard_slices = Table(
'dashboard_slices', Model.metadata,
Column('id', Integer, primary_key=True),
Column('dashboard_id', Integer, ForeignKey('dashboards.id')),
Column('slice_id', Integer, ForeignKey('slices.id')),
)
dashboard_user = Table(
'dashboard_user', Model.metadata,
Column('id', Integer, primary_key=True),
Column('user_id', Integer, ForeignKey('ab_user.id')),
Column('dashboard_id', Integer, ForeignKey('dashboards.id'))
)
class Dashboard(Model, AuditMixinNullable, ImportMixin):
"""The dashboard object!"""
__tablename__ = 'dashboards'
id = Column(Integer, primary_key=True)
dashboard_title = Column(String(500))
position_json = Column(Text)
description = Column(Text)
css = Column(Text)
json_metadata = Column(Text)
slug = Column(String(255), unique=True)
slices = relationship(
'Slice', secondary=dashboard_slices, backref='dashboards')
owners = relationship("User", secondary=dashboard_user)
export_fields = ('dashboard_title', 'position_json', 'json_metadata',
'description', 'css', 'slug')
def __repr__(self):
return self.dashboard_title
@property
def table_names(self):
return ", ".join({"{}".format(s.datasource) for s in self.slices})
@property
def url(self):
return "/caravel/dashboard/{}/".format(self.slug or self.id)
@property
def datasources(self):
return {slc.datasource for slc in self.slices}
@property
def sqla_metadata(self):
metadata = MetaData(bind=self.get_sqla_engine())
return metadata.reflect()
def dashboard_link(self):
title = escape(self.dashboard_title)
return Markup(
'<a href="{self.url}">{title}</a>'.format(**locals()))
@property
def json_data(self):
d = {
'id': self.id,
'metadata': self.params_dict,
'dashboard_title': self.dashboard_title,
'slug': self.slug,
'slices': [slc.data for slc in self.slices],
'position_json': json.loads(self.position_json) if self.position_json else [],
}
return json.dumps(d)
@property
def params(self):
return self.json_metadata
@params.setter
def params(self, value):
self.json_metadata = value
@property
def position_array(self):
if self.position_json:
return json.loads(self.position_json)
return []
@classmethod
def import_obj(cls, dashboard_to_import, import_time=None):
"""Imports the dashboard from the object to the database.
Once dashboard is imported, json_metadata field is extended and stores
remote_id and import_time. It helps to decide if the dashboard has to
be overridden or just copies over. Slices that belong to this
dashboard will be wired to existing tables. This function can be used
to import/export dashboards between multiple caravel instances.
Audit metadata isn't copies over.
"""
def alter_positions(dashboard, old_to_new_slc_id_dict):
""" Updates slice_ids in the position json.
Sample position json:
[{
"col": 5,
"row": 10,
"size_x": 4,
"size_y": 2,
"slice_id": "3610"
}]
"""
position_array = dashboard.position_array
for position in position_array:
if 'slice_id' not in position:
continue
old_slice_id = int(position['slice_id'])
if old_slice_id in old_to_new_slc_id_dict:
position['slice_id'] = '{}'.format(
old_to_new_slc_id_dict[old_slice_id])
dashboard.position_json = json.dumps(position_array)
logging.info('Started import of the dashboard: {}'
.format(dashboard_to_import.to_json()))
session = db.session
logging.info('Dashboard has {} slices'
.format(len(dashboard_to_import.slices)))
# copy slices object as Slice.import_slice will mutate the slice
# and will remove the existing dashboard - slice association
slices = copy(dashboard_to_import.slices)
old_to_new_slc_id_dict = {}
new_filter_immune_slices = []
new_expanded_slices = {}
i_params_dict = dashboard_to_import.params_dict
for slc in slices:
logging.info('Importing slice {} from the dashboard: {}'.format(
slc.to_json(), dashboard_to_import.dashboard_title))
new_slc_id = Slice.import_obj(slc, import_time=import_time)
old_to_new_slc_id_dict[slc.id] = new_slc_id
# update json metadata that deals with slice ids
if ('filter_immune_slices' in i_params_dict and
slc.id in i_params_dict['filter_immune_slices']):
new_filter_immune_slices.append(new_slc_id)
new_slc_id_str = '{}'.format(new_slc_id)
old_slc_id_str = '{}'.format(slc.id)
if ('expanded_slices' in i_params_dict and
old_slc_id_str in i_params_dict['expanded_slices']):
new_expanded_slices[new_slc_id_str] = (
i_params_dict['expanded_slices'][old_slc_id_str])
# override the dashboard
existing_dashboard = None
for dash in session.query(Dashboard).all():
if ('remote_id' in dash.params_dict and
dash.params_dict['remote_id'] ==
dashboard_to_import.id):
existing_dashboard = dash
dashboard_to_import.id = None
alter_positions(dashboard_to_import, old_to_new_slc_id_dict)
dashboard_to_import.alter_params(import_time=import_time)
if new_expanded_slices:
dashboard_to_import.alter_params(
expanded_slices=new_expanded_slices)
if new_filter_immune_slices:
dashboard_to_import.alter_params(
filter_immune_slices=new_filter_immune_slices)
new_slices = session.query(Slice).filter(
Slice.id.in_(old_to_new_slc_id_dict.values())).all()
if existing_dashboard:
existing_dashboard.override(dashboard_to_import)
existing_dashboard.slices = new_slices
session.flush()
return existing_dashboard.id
else:
# session.add(dashboard_to_import) causes sqlachemy failures
# related to the attached users / slices. Creating new object
# allows to avoid conflicts in the sql alchemy state.
copied_dash = dashboard_to_import.copy()
copied_dash.slices = new_slices
session.add(copied_dash)
session.flush()
return copied_dash.id
@classmethod
def export_dashboards(cls, dashboard_ids):
copied_dashboards = []
datasource_ids = set()
for dashboard_id in dashboard_ids:
# make sure that dashboard_id is an integer
dashboard_id = int(dashboard_id)
copied_dashboard = (
db.session.query(Dashboard)
.options(subqueryload(Dashboard.slices))
.filter_by(id=dashboard_id).first()
)
make_transient(copied_dashboard)
for slc in copied_dashboard.slices:
datasource_ids.add((slc.datasource_id, slc.datasource_type))
# add extra params for the import
slc.alter_params(
remote_id=slc.id,
datasource_name=slc.datasource.name,
schema=slc.datasource.name,
database_name=slc.datasource.database.database_name,
)
copied_dashboard.alter_params(remote_id=dashboard_id)
copied_dashboards.append(copied_dashboard)
eager_datasources = []
for dashboard_id, dashboard_type in datasource_ids:
eager_datasource = SourceRegistry.get_eager_datasource(
db.session, dashboard_type, dashboard_id)
eager_datasource.alter_params(
remote_id=eager_datasource.id,
database_name=eager_datasource.database.database_name,
)
make_transient(eager_datasource)
eager_datasources.append(eager_datasource)
return pickle.dumps({
'dashboards': copied_dashboards,
'datasources': eager_datasources,
})
class Queryable(object):
"""A common interface to objects that are queryable (tables and datasources)"""
@property
def column_names(self):
return sorted([c.column_name for c in self.columns])
@property
def main_dttm_col(self):
return "timestamp"
@property
def groupby_column_names(self):
return sorted([c.column_name for c in self.columns if c.groupby])
@property
def filterable_column_names(self):
return sorted([c.column_name for c in self.columns if c.filterable])
@property
def dttm_cols(self):
return []
@property
def url(self):
return '/{}/edit/{}'.format(self.baselink, self.id)
@property
def explore_url(self):
if self.default_endpoint:
return self.default_endpoint
else:
return "/caravel/explore/{obj.type}/{obj.id}/".format(obj=self)
class Database(Model, AuditMixinNullable):
"""An ORM object that stores Database related information"""
__tablename__ = 'dbs'
id = Column(Integer, primary_key=True)
database_name = Column(String(250), unique=True)
sqlalchemy_uri = Column(String(1024))
password = Column(EncryptedType(String(1024), config.get('SECRET_KEY')))
cache_timeout = Column(Integer)
select_as_create_table_as = Column(Boolean, default=False)
expose_in_sqllab = Column(Boolean, default=False)
allow_run_sync = Column(Boolean, default=True)
allow_run_async = Column(Boolean, default=False)
allow_ctas = Column(Boolean, default=False)
allow_dml = Column(Boolean, default=False)
force_ctas_schema = Column(String(250))
extra = Column(Text, default=textwrap.dedent("""\
{
"metadata_params": {},
"engine_params": {}
}
"""))
def __repr__(self):
return self.database_name
@property
def name(self):
return self.database_name
@property
def backend(self):
url = make_url(self.sqlalchemy_uri_decrypted)
return url.get_backend_name()
def set_sqlalchemy_uri(self, uri):
password_mask = "X" * 10
conn = sqla.engine.url.make_url(uri)
if conn.password != password_mask:
# do not over-write the password with the password mask
self.password = conn.password
conn.password = password_mask if conn.password else None
self.sqlalchemy_uri = str(conn) # hides the password
def get_sqla_engine(self, schema=None):
extra = self.get_extra()
url = make_url(self.sqlalchemy_uri_decrypted)
params = extra.get('engine_params', {})
if self.backend == 'presto' and schema:
if '/' in url.database:
url.database = url.database.split('/')[0] + '/' + schema
else:
url.database += '/' + schema
elif schema:
url.database = schema
return create_engine(url, **params)
def get_reserved_words(self):
return self.get_sqla_engine().dialect.preparer.reserved_words
def get_quoter(self):
return self.get_sqla_engine().dialect.identifier_preparer.quote
def get_df(self, sql, schema):
eng = self.get_sqla_engine(schema=schema)
cur = eng.execute(sql, schema=schema)
cols = [col[0] for col in cur.cursor.description]
df = pd.DataFrame(cur.fetchall(), columns=cols)
return df
def compile_sqla_query(self, qry, schema=None):
eng = self.get_sqla_engine(schema=schema)
compiled = qry.compile(eng, compile_kwargs={"literal_binds": True})
return '{}'.format(compiled)
def select_star(
self, table_name, schema=None, limit=100, show_cols=False,
indent=True):
"""Generates a ``select *`` statement in the proper dialect"""
for i in range(10):
print(schema)
quote = self.get_quoter()
fields = '*'
table = self.get_table(table_name, schema=schema)
if show_cols:
fields = [quote(c.name) for c in table.columns]
if schema:
table_name = schema + '.' + table_name
qry = select(fields).select_from(text(table_name))
if limit:
qry = qry.limit(limit)
sql = self.compile_sqla_query(qry)
if indent:
sql = sqlparse.format(sql, reindent=True)
return sql
def wrap_sql_limit(self, sql, limit=1000):
qry = (
select('*')
.select_from(TextAsFrom(text(sql), ['*'])
.alias('inner_qry')).limit(limit)
)
return self.compile_sqla_query(qry)
def safe_sqlalchemy_uri(self):
return self.sqlalchemy_uri
@property
def inspector(self):
engine = self.get_sqla_engine()
return sqla.inspect(engine)
def all_table_names(self, schema=None):
return sorted(self.inspector.get_table_names(schema))
def all_view_names(self, schema=None):
views = []
try:
views = self.inspector.get_view_names(schema)
except Exception as e:
pass
return views
def all_schema_names(self):
return sorted(self.inspector.get_schema_names())
@property
def db_engine_spec(self):
engine_name = self.get_sqla_engine().name or 'base'
return db_engine_specs.engines.get(
engine_name, db_engine_specs.BaseEngineSpec)
def grains(self):
"""Defines time granularity database-specific expressions.
The idea here is to make it easy for users to change the time grain
form a datetime (maybe the source grain is arbitrary timestamps, daily
or 5 minutes increments) to another, "truncated" datetime. Since
each database has slightly different but similar datetime functions,
this allows a mapping between database engines and actual functions.
"""
return self.db_engine_spec.time_grains
def grains_dict(self):
return {grain.name: grain for grain in self.grains()}
def get_extra(self):
extra = {}
if self.extra:
try:
extra = json.loads(self.extra)
except Exception as e:
logging.error(e)
return extra
def get_table(self, table_name, schema=None):
extra = self.get_extra()
meta = MetaData(**extra.get('metadata_params', {}))
return Table(
table_name, meta,
schema=schema or None,
autoload=True,
autoload_with=self.get_sqla_engine())
def get_columns(self, table_name, schema=None):
return self.inspector.get_columns(table_name, schema)
def get_indexes(self, table_name, schema=None):
return self.inspector.get_indexes(table_name, schema)
@property
def sqlalchemy_uri_decrypted(self):
conn = sqla.engine.url.make_url(self.sqlalchemy_uri)
conn.password = self.password
return str(conn)
@property
def sql_url(self):
return '/caravel/sql/{}/'.format(self.id)
@property
def perm(self):
return (
"[{obj.database_name}].(id:{obj.id})").format(obj=self)
class SqlaTable(Model, Queryable, AuditMixinNullable, ImportMixin):
"""An ORM object for SqlAlchemy table references"""
type = "table"
__tablename__ = 'tables'
id = Column(Integer, primary_key=True)
table_name = Column(String(250))
main_dttm_col = Column(String(250))
description = Column(Text)
default_endpoint = Column(Text)
database_id = Column(Integer, ForeignKey('dbs.id'), nullable=False)
is_featured = Column(Boolean, default=False)
user_id = Column(Integer, ForeignKey('ab_user.id'))
owner = relationship('User', backref='tables', foreign_keys=[user_id])
database = relationship(
'Database',
backref=backref('tables', cascade='all, delete-orphan'),
foreign_keys=[database_id])
offset = Column(Integer, default=0)
cache_timeout = Column(Integer)
schema = Column(String(255))
sql = Column(Text)
params = Column(Text)
baselink = "tablemodelview"
export_fields = (
'table_name', 'main_dttm_col', 'description', 'default_endpoint',
'database_id', 'is_featured', 'offset', 'cache_timeout', 'schema',
'sql', 'params')
__table_args__ = (
sqla.UniqueConstraint(
'database_id', 'schema', 'table_name',
name='_customer_location_uc'),)
def __repr__(self):
return self.table_name
@property
def description_markeddown(self):
return utils.markdown(self.description)
@property
def link(self):
table_name = escape(self.table_name)
return Markup(
'<a href="{self.explore_url}">{table_name}</a>'.format(**locals()))
@property
def perm(self):
return (
"[{obj.database}].[{obj.table_name}]"
"(id:{obj.id})").format(obj=self)
@property
def name(self):
return self.table_name
@property
def full_name(self):
return utils.get_datasource_full_name(
self.database, self.table_name, schema=self.schema)
@property
def dttm_cols(self):
l = [c.column_name for c in self.columns if c.is_dttm]
if self.main_dttm_col not in l:
l.append(self.main_dttm_col)
return l
@property
def num_cols(self):
return [c.column_name for c in self.columns if c.isnum]
@property
def any_dttm_col(self):
cols = self.dttm_cols
if cols:
return cols[0]
@property
def html(self):
t = ((c.column_name, c.type) for c in self.columns)
df = pd.DataFrame(t)
df.columns = ['field', 'type']
return df.to_html(
index=False,
classes=(
"dataframe table table-striped table-bordered "
"table-condensed"))
@property
def metrics_combo(self):
return sorted(
[
(m.metric_name, m.verbose_name or m.metric_name)
for m in self.metrics],
key=lambda x: x[1])
@property
def sql_url(self):
return self.database.sql_url + "?table_name=" + str(self.table_name)
@property
def time_column_grains(self):
return {
"time_columns": self.dttm_cols,
"time_grains": [grain.name for grain in self.database.grains()]
}
def get_col(self, col_name):
columns = self.columns
for col in columns:
if col_name == col.column_name:
return col
def query( # sqla
self, groupby, metrics,
granularity,
from_dttm, to_dttm,
filter=None, # noqa
is_timeseries=True,
timeseries_limit=15,
timeseries_limit_metric=None,
row_limit=None,
inner_from_dttm=None,
inner_to_dttm=None,
orderby=None,
extras=None,
columns=None):
"""Querying any sqla table from this common interface"""
# For backward compatibility
if granularity not in self.dttm_cols:
granularity = self.main_dttm_col
cols = {col.column_name: col for col in self.columns}
metrics_dict = {m.metric_name: m for m in self.metrics}
qry_start_dttm = datetime.now()
if not granularity and is_timeseries:
raise Exception(_(
"Datetime column not provided as part table configuration "
"and is required by this type of chart"))
metrics_exprs = [metrics_dict.get(m).sqla_col for m in metrics]
timeseries_limit_metric = metrics_dict.get(timeseries_limit_metric)
timeseries_limit_metric_expr = None
if timeseries_limit_metric:
timeseries_limit_metric_expr = \
timeseries_limit_metric.sqla_col
if metrics:
main_metric_expr = metrics_exprs[0]
else:
main_metric_expr = literal_column("COUNT(*)").label("ccount")
select_exprs = []
groupby_exprs = []
if groupby:
select_exprs = []
inner_select_exprs = []
inner_groupby_exprs = []
for s in groupby:
col = cols[s]
outer = col.sqla_col
inner = col.sqla_col.label(col.column_name + '__')
groupby_exprs.append(outer)
select_exprs.append(outer)
inner_groupby_exprs.append(inner)
inner_select_exprs.append(inner)
elif columns:
for s in columns:
select_exprs.append(cols[s].sqla_col)
metrics_exprs = []
if granularity: