Phoenix contexts
Phoenix 1.3 uses a domain based development system where the different parts of the app are grouped in contexts/domains. See contexts for documentation.
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Using contexts
We group our functions into context modules based on which part of the app they are found.
defmodule App.Accounts do
# All the functions pertaining to account management
def create_user(params) do
# code for creating users
end
end
Resolvers It is harder to maintain a context module because placing all the functions in one module can grow big very quickly. To make code maintainance easier, we separate functions into resolvers based on the GraphQL structure. In the context module, we just delegate functions to the resolvers.
defmodule App.Accounts.Resolvers.UserResolver do
def create_user(params) do
# code for creating users
end
# other functions pertaining to user management and user helper functions
end
defmodule App.Accounts.Resolvers.ProfileResolver do
def update_profile(user, params) do
# code for updating a users profile
end
# other functions pertaining to profile management and profile helper functions
end
defmodule App.Accounts do
alias App.Accounts.Resolvers.{
UserResolver,
ProfileResolver
}
# This group contains functions in the UserResolver module
defdelegate create_user(params), to: UserResolver
defdelegate update_profile(user, params), to: ProfileResolver
end
Suggested file structure Put your contexts as lib/contextname/. In this example below, our Accounts context belongs in lib/accounts/.
App
| lib
| accounts/
| resolvers/
| user_resolver.ex
| profile_resolver.ex
| accounts.ex
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