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