Params¶

Type-safe Params¶

An old Chinese proverb says, "If something is important, then repeat it three times". So,

Params in Runcobo are type-safe.

Three Steps To Use Params¶

First, declare what params you expect and what type you expect by following methods: url, query, form and json.
Next, Runcobo parses request and wraps params to a local variable called params.
Third, use params variable to get or set request params.

Url Params¶

class UrlExample < BaseAction
  get "/url_example/:a/:b"
  url NamedTuple(a: Int32, b: Int32)

  call do
    sum = params[:a] + params[:b]
    render_plain sum.to_s
  end
end

Query Params¶

class QueryExample < BaseAction
  get "/query_example"
  query NamedTuple(a: Int32, b: Int32)

  call do
    sum = params[:a] + params[:b]
    render_plain sum.to_s
  end
end

Form Params¶

class FormExample < BaseAction
  post "/form_example"
  form NamedTuple(a: Int32, b: Int32)

  call do
    sum = params[:a] + params[:b]
    render_plain sum.to_s
  end
end

JSON Params¶

class JsonExample < BaseAction
  post "/json_example"
  json NamedTuple(a: Int32, b: Int32)

  call do
    sum = params[:a] + params[:b]
    render_plain sum.to_s
  end
end

Params Merge Order¶

You can declare various kinds of params in a action. If params are in same key, they will be merged in following order:

Query Params < Form Params < JSON Params < Url Params