A little bit of ConnectWise SQL converted to AREL, https://github.com/rails/arel. Took me a while to work out how to do the left joins, be we got there. To me it would be nice to have a 'outer_join' or 'join_outer' method which does 'join(x, Arel::Nodes::OuterJoin)'.
select * from config c join cs_survey s ON s.cs_survey_recid = c.cs_survey_recid join company ON c.company_recid = company.company_recid left join agr_config on agr_config.config_recid = c.config_recid left join agr_header on agr_config.agr_header_recid = agr_header.agr_header_recid WHERE s.survey_name='CSS - DNS'
to AREL:
config = Arel::Table.new(:config)
cs_survey = Arel::Table.new(:cs_survey)
company = Arel::Table.new(:company)
agr_config = Arel::Table.new(:agr_config)
agr_header = Arel::Table.new(:agr_header)
query = config.
join(cs_survey).on(config[:cs_survey_recid].eq(cs_survey[:cs_survey_recid])).
join(company).on(config[:company_recid].eq(company[:company_recid])).
join(agr_config, Arel::Nodes::OuterJoin).on(agr_config[:config_recid].eq(config[:config_recid])).
join(agr_header, Arel::Nodes::OuterJoin).on(agr_header[:agr_header_recid].eq(agr_config[:agr_header_recid])).
where(cs_survey[:survey_name].eq('CSS - DNS')).
project(Arel.sql('*'))
puts query.to_sql
The advantage or course is that the AREL object is extensible and extra where clauses or joins can be added as required. Cool.
Update: Converting some aggregate functions to AREL:
select si.ItemName, o.OrganizationID, COUNT(*) from ExchangeAccounts a join ExchangeOrganizations o ON o.ItemID = a.ItemID join ServiceItems si on o.ItemID = si.ItemID where a.AccountType IN (1,5,6) group by si.ItemName, o.OrganizationID
to:
a = ExchangeAccounts.arel_table
o = ExchangeOrganizations.arel_table
si = ServiceItems.arel_table
query = a.
join(o).on(o[:ItemID].eq(a[:ItemID])).
join(si).on(o[:ItemID].eq(si[:ItemID])).
where(a[:AccountType].in([1,5,6])).
group(si[:ItemName], o[:OrganizationID]).
project(si[:ItemName], o[:OrganizationID], Arel.sql('*').count)
puts query.to_sql
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