tab/app/grids/transactions_query.rb

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class TransactionsQuery
def initialize user
@user = user
@transactions = Arel::Table.new(:transactions)
@perspectived = Arel::Table.new(:perspectived_transactions)
@peers = Arel::Table.new(:users).alias('peers')
end
def arel
Arel::SelectManager.new(ActiveRecord::Base)
.from(transactions)
.join(@peers).on(@peers[:id].eq(@perspectived[:peer_id]))
.project(
@perspectived[:amount],
@perspectived[:date],
@peers[:name].as('peer'),
@perspectived[:issuer_id],
@perspectived[:message]
)
end
def transactions
Arel::Nodes::TableAlias.new(incoming.union(outgoing), @perspectived.name)
end
def outgoing
@transactions
.where(@transactions[:debtor_id].eq(@user.id))
.project(
(@transactions[:amount]*Arel::Nodes::SqlLiteral.new("-1")).as('amount'),
@transactions[:creditor_id].as('peer_id'),
@transactions[:created_at].as('date'),
@transactions[:issuer_id],
@transactions[:issuer_type],
@transactions[:message]
)
end
def incoming
@user.incoming_transactions.arel
@transactions
.where(@transactions[:debtor_id].eq(@user.id))
.project(
@transactions[:amount],
@transactions[:debtor_id].as('peer_id'),
@transactions[:created_at].as('date'),
@transactions[:issuer_id],
@transactions[:issuer_type],
@transactions[:message]
)
end
end