Maps not merging inside select_merge

Questions / Help
,
1

We can use select_merge ro build a long query bit by bit in which multiple selects are used.

This is my code:

              query = from p in Model, select: %{}
                query = if k == "$avg" do
                  from p in query, select_merge: %{avg: avg(p.id)}
                else
                  query
                end

                  query = if k == "$count" do
                    from p in query, select_merge: %{count: count(p.pass)}
                  else
                    query
                  end

On console after inspecting query I got these results:

 #Ecto.Query<from m Model, select: %{avg: avg(m.id)}>
 #Ecto.Query<from m in Model, select: %{count: count(m.pass)}>

And final query is:

 #Ecto.Query<from m in Model, select: %{}>

In the final query the select is empty. It suppose to have contain both the above queries inside of it.

Any help will be much appreciated
Thanks

2

I executed that code and it works

query = from p in Model, select: %{} 
    query = if true do from p in query, select_merge: %{avg: avg(p.id)} else query end 
    query = if true do from p in query, select_merge: %{count: count(p.pass)} else query end

iex-#Ecto.Query<from h in Model, select: %{avg: avg(h.id), count: count(h.pass)}>

maybe something related to double quote and single quote

"$count" == '$count'
false
3

I am using Enum.reduce .Its the problem with that. Thanks for your answer.