98 lines
2.4 KiB
Ruby
98 lines
2.4 KiB
Ruby
class DataTable
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def initialize user, params
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@user = user
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@params = sanitize_params(params)
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@transactions = TransactionsQuery.new(@user)
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@table = @transactions.arel_table
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end
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def json
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response_json(@params[:draw], data)
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end
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def data
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ActiveRecord::Base.connection.execute(self.query.to_sql)
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end
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def query
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pred = predicates
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q = @transactions.query
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q = q.where(pred) if pred
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q
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end
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def predicates
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[ *range_predicates(:amount),
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*range_predicates(:time),
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eq_predicate(:peer),
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eq_predicate(:issuer),
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like_predicate(:message)
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].compact.inject { |l, r| l.and(r) }
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end
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def range_predicates name
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col = @params[:columns][name]
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[
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(@table[:name].gteq(col[:lower]) if col[:lower]),
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(@table[:name].lteq(col[:upper]) if col[:upper])
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]
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end
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def eq_predicate name
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value = @params[:columns][:name][:value]
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@table[:name].eq(value) if value
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end
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def like_predicate name
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value = @params[:columns][:name][:value]
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@table[:name].matches("%#{value}%") if value
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end
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private
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def sanitize_params(params)
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# Parsing according to https://datatables.net/manual/server-side
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clean = {
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draw: params.require(:draw).to_i,
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start: params.require(:start).to_i,
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length: params.require(:length).to_i,
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columns: Hash.new
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}
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params.require(:columns).each do |i, column|
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type, value = column.require(:search)[:value].split(':')
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h = clean[:columns][column.require(:data).to_sym] = {
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name: column[:name],
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searchable: column[:searchable] == 'true',
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orderable: column[:orderable] == 'true',
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type: type
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}
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if type == 'number-range'
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h[:lower], h[:upper] = value.split('~').map &:to_i
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elsif type == 'date-range'
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h[:lower], h[:upper] = value.split('~').map &:to_datetime
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else
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h[:value] = value
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end
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end
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return clean
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end
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def response_json(draw, selection)
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{
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draw: draw,
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recordsTotal: @user.transactions.count,
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recordsFiltered: selection.count,
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#data: selection.offset(params[:start]).take(params[:length]).map { |transaction| {
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#time: transaction.created_at,
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#amount: transaction.signed_amount_for(user),
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#peer: transaction.peer_of(user).try(:name),
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#issuer: transaction.issuer.name,
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#message: transaction.message,
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#}}
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data: selection
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}
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end
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end
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