Hi Michael, I'm trying to adapt your answer above to declare indexes inside the __table_args__ tuple in my model class. However, when I run the alembic command to generate the migration script, the JSONB column indexes are not generated.
I posted a SO question with more details, perhaps you could help me understand what I'm missing in the index generation http://stackoverflow.com/questions/39190935/jsonb-field-indexes-in-sqlalchemy-declarative-mappers Thanks in advance, Shailesh On Tuesday, 1 July 2014 10:53:13 UTC+5:30, 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 <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. > > > -- > 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. > > > -- 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+unsubscr...@googlegroups.com. To post to this group, send email to sqlalchemy@googlegroups.com. Visit this group at https://groups.google.com/group/sqlalchemy. For more options, visit https://groups.google.com/d/optout.
