Perfect thanks Mike. On Wednesday, July 2, 2014 10:17:17 AM UTC-7, Michael Bayer wrote: > > > On 7/2/14, 11:38 AM, Phillip Aquilina wrote: > > This worked as described. Thanks again. I have a followup question. It > doesn't seem like there's an analog to table.create(checkfirst=True) for an > Index. I found this issue > <https://bitbucket.org/zzzeek/sqlalchemy/issue/527/indexcreate-should-take-checkfirst> > > that seems to mention having this functionality but it doesn't look like > it's been implemented? Is there a normal workaround for this? > > > typically Index is bundled with its parent Table, and the conditional > aspect of it comes from the Table being created conditionally. > Otherwise, if the Index is added after the fact, typically people are using > migration tools to get that so that's where the conditional aspect comes > in. So the case where Index.create() really needs conditional behavior is > slim. You can for now use inspector: > > from sqlalchemy import inspect > insp = inspect(engine) > for idx in insp.get_indexes('tablename'): > if idx['name'] == 'myname': > break > else: > Index('myname', x, y, z).create(engine) > > > > > > On Tuesday, July 1, 2014 10:03:40 AM UTC-7, Phillip Aquilina wrote: >> >> Ah! I'll give that a try. Thanks Mike. >> >> On Monday, June 30, 2014 10:23:13 PM UTC-7, Michael Bayer wrote: >>> >>> per the SO answer, you're looking for "CREATE INDEX ON >>> publishers((info->>'name'));". Either you can emit this directly as a >>> string, or use Index, just as it states: >>> >>> from sqlalchemy import create_engine, Integer, Index, Table, Column, >>> MetaData >>> from sqlalchemy.dialects.postgresql import JSON >>> >>> e = create_engine("postgresql://scott:tiger@localhost/test", echo=True) >>> >>> m = MetaData() >>> publishers = Table('publishers', m, Column('id', Integer), >>> Column('info', JSON)) >>> Index("foo", publishers.c.info['name'].astext) >>> >>> m.create_all(e) >>> >>> output: >>> >>> CREATE TABLE publishers ( >>> id INTEGER, >>> info JSON >>> ) >>> >>> >>> CREATE INDEX foo ON publishers ((info ->> 'name')) >>> >>> >>> >>> >>> >>> On 7/1/14, 1:14 AM, Mike Bayer wrote: >>> >>> I'm not familiar with any other style of index for this column type. >>> If you can show me at >>> http://www.postgresql.org/docs/9.4/static/datatype-json.html or >>> wherever what specific DDL you're looking for, you can simply emit it using >>> engine.execute("<ddl>"). >>> >>> >>> On 6/30/14, 11:02 PM, Phillip Aquilina wrote: >>> >>> Thanks for replying. I've read through that doc and I still don't see >>> how that addresses my question. Is there somewhere in there that describes >>> how to create an index on a json field? It seems like to me it's simple to >>> create an index on a column but this would be creating an index on nested >>> data inside the column. >>> >>> - Phil >>> >>> On Monday, June 30, 2014 6:07:51 PM UTC-7, Michael Bayer wrote: >>>> >>>> SQLAlchemy's API allows CREATE INDEX via the Index construct: >>>> http://docs.sqlalchemy.org/en/rel_0_9/core/constraints.html?highlight=index#indexes >>>> >>>> >>>> On 6/30/14, 6:21 PM, Phillip Aquilina wrote: >>>> >>>> Using postgresql, I have a JSON type column. My understanding from >>>> their docs was that only jsonb columns could have an index created on them >>>> (a feature of postgresql 9.4) but then I found an SO answer >>>> <http://stackoverflow.com/questions/17807030/how-to-create-index-on-json-field-in-postgres-9-3> >>>> that >>>> said otherwise. I haven't had the chance to test it since I'm away from my >>>> dev environment, but the sqlalchemy docs seem to support this idea >>>> <http://docs.sqlalchemy.org/en/rel_0_9/dialects/postgresql.html?highlight=json#sqlalchemy.dialects.postgresql.JSON>, >>>> >>>> mentioning the availability of "Index operations." >>>> >>>> Unless I'm missing something obvious (very possible), it seems like >>>> this can be done through sql, but is there a way to create an index on a >>>> json field through the sqlalchemy api? I can't seem to find a way to do >>>> this. >>>> >>>> Thanks, >>>> Phil >>>> -- >>>> You received this message because you are subscribed to the Google >>>> Groups "sqlalchemy" group. >>>> To unsubscribe from this group and stop receiving emails from it, send >>>> an email to sqlalchemy+...@googlegroups.com. >>>> To post to this group, send email to sqlal...@googlegroups.com. >>>> Visit this group at http://groups.google.com/group/sqlalchemy. >>>> For more options, visit https://groups.google.com/d/optout. >>>> >>>> >>>> -- >>> You received this message because you are subscribed to the Google >>> Groups "sqlalchemy" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to sqlalchemy+...@googlegroups.com. >>> To post to this group, send email to sqlal...@googlegroups.com. >>> Visit this group at http://groups.google.com/group/sqlalchemy. >>> For more options, visit https://groups.google.com/d/optout. >>> >>> >>> -- >>> You received this message because you are subscribed to the Google >>> Groups "sqlalchemy" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to sqlalchemy+...@googlegroups.com. >>> To post to this group, send email to sqlal...@googlegroups.com. >>> Visit this group at http://groups.google.com/group/sqlalchemy. >>> For more options, visit https://groups.google.com/d/optout. >>> >>> >>> -- > You received this message because you are subscribed to the Google Groups > "sqlalchemy" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to sqlalchemy+...@googlegroups.com <javascript:>. > To post to this group, send email to sqlal...@googlegroups.com > <javascript:>. > Visit this group at http://groups.google.com/group/sqlalchemy. > For more options, visit https://groups.google.com/d/optout. > > >
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