tab/app/controllers/concerns/data_table.rb

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module DataTable
extend ActiveSupport::Concern
def apply_filter(user, params)
params = sanitize_params(params)
selection = user.transactions
# filter time
lower = params[:columns][:time][:lower]
upper = params[:columns][:time][:upper]
if lower and upper
selection = selection.where(created_at: lower..upper)
elsif lower
selection = selection.where('created_at > :lower', lower: lower)
elsif upper
selection = selection.where('created_at < :upper', upper: upper)
end
# filter amount TODO this filters on absolute value
lower = params[:columns][:amount][:lower]
upper = params[:columns][:amount][:upper]
if lower and upper
selection = selection.where(amount: lower..upper)
elsif lower
selection = selection.where('amount > :lower', lower: lower)
elsif upper
selection = selection.where('amount < :upper', upper: upper)
end
# filter peer # TODO peer.name
peer = params[:columns][:peer][:value]
if peer
selection = selection.where("(debtor_id = :id AND creditor_id LIKE :peer) OR (creditor_id = :id AND debtor_id LIKE :peer)", id: user.id, peer: "%#{peer}%")
end
# filter issuer # TODO issuer.name
issuer = params[:columns][:issuer][:value]
if issuer
selection = selection.where("issuer_id LIKE :re", re: "%#{issuer}%")
end
# filter message
message = params[:columns][:message][:value]
if message
selection = selection.where("message LIKE :re", re: "%#{message}%")
end
selection_to_json(user, params[:draw], selection)
end
private
def sanitize_params(params)
# Parsing according to https://datatables.net/manual/server-side
clean = {
draw: params.require(:draw).to_i,
start: params.require(:start).to_i,
length: params.require(:length).to_i,
columns: Hash.new
}
params.require(:columns).each do |i, column|
type, value = column.require(:search)[:value].split(':')
h = clean[:columns][column.require(:data).to_sym] = {
name: column[:name],
searchable: column[:searchable] == 'true',
orderable: column[:orderable] == 'true',
type: type
}
if type == 'number-range'
h[:lower], h[:upper] = value.split('~').map &:to_i
elsif type == 'date-range'
h[:lower], h[:upper] = value.split('~').map &:to_datetime
else
h[:value] = value
end
end
return clean
end
def selection_to_json(user, draw, selection)
{
draw: draw,
recordsTotal: user.transactions.count,
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,
amount: transaction.signed_amount_for(user),
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peer: transaction.peer_of(user).try(:name),
issuer: transaction.issuer.name,
message: transaction.message,
}}
}
end
end