![]() Now if still you have issue, start removing your Joins one by one directly from DB to see what is broken. Use _sql(:all, Repo, query) where query is your from result then run the generated SQL directly on your DB and check the errors there, you can adjust your query there and translate it back to Ecto. Now if none of the above solved your issue, then bypass the Schema and replace the UserPost with "user_posts" and construct all of the joins manually. Our current pattern has been to use the Ecto.Query Macro API to define queries. Currently, we are using a Postgres database, and have defined a number of schemas in Ecto, some of which have associations. ( again better to do this in one Ecto.Query as you are not breaking things into bits. Hello everyone, My team and I are looking for perspectives on best-practices when defining associations in Ecto. Personally I prefer singular based on what each row' stores: Order, Product, User, Item, etc. In your Where clause, instead of second where use and. I've went to check other elixir projects to see what convention they used( like Phoenix and Elixir ) and I've noticed that most directory names are singular. When I have lots of join, I prefer to use join and on so I don't confuse Ecto.Īlso move the where after the join, not really important however an old saying in RDBMS. Basically I can name the directories queues, registries and supervisors or queue, registry and supervisor(the choice is between plural and singular). Here is an example from Ecto Doc: from c in Comment, The convention (I believe inherited from Rails) is that it should be the plural of your schema. I tried with changing s with UserPosts but it says that the columns don't exist in the table. (elixir) lib/kernel/parallel_compiler.ex:198: anonymous fn/4 in _workers/6 (stdlib) erl_eval.erl:670: :erl_eval.do_apply/6 (stdlib) lists.erl:1338: :lists.foreach/2 ** (CompileError) lib/nethub_api_web/resolvers/content.ex:33: undefined function s/0 = Compilation error in file lib/nethub_api_web/resolvers/content.ex = Lib/nethub_api_web/resolvers/content.ex:93 Warning: variable "s" does not exist and is being expanded to "s()", please use parentheses to remove the ambiguity or change the variable name 'Plural - because it is a set of things.' Primary Key Names 'Every table must have an id primary key (surrogate) using a sequence (identity is ok sometimes).' 'I prefer singular names for column without any prefix or suffix.' 'I would have said postid but for the past several years I've switched to just id. then use (:all, Repo, query) where query is your from result then run the generated SQL directly on your DB and check the errors there, you can adjust your query there and translate it back to Ecto. ![]() Run this command : mix createtasks This command will create a. Now if none of the above solved your issue, then bypass the Schema and replace the UserPost with 'userposts' and construct all of the joins manually. Lib/nethub_api_web/resolvers/content.ex:33 Generate a migration file for our task table, this is a single step in the process of constructing your database. ![]() Put 'create' in the name of a migration that creates an entire new table. Where: s.inserted_at >= ^Timex.beginning_of_month(Timex.now()),īut it gives the following warnings and errors: warning: variable "s" does not exist and is being expanded to "s()", please use parentheses to remove the ambiguity or change the variable name Make your table names plural, but schema and module names singular. Also, the primary key is not an integer nor named id.I'm trying to do a query that fetches the user_posts table and the respective associations upvotes, downvotes and comments. Notice that the table columns are “aliased” using the source: keyword so I can use nice underscored field names in my code. If you'd like to see some of the discussion around where these decisions were made, check out this issue on the Phoenix repo. I bolded the most important part for your convenience. Timestamps(inserted_at: :transactiondate, updated_at: false You may use plural names for your tables and router paths, but those are explicitly written at your system boundaries. Import įield :catalog_id, :string, primary_key: true, source: :catalogidįield :item_description, :string, source: :itemdescriptionįield :item_id, :string, primary_key: true, source: :itemidįield :status_web, :string, source: :statusweb Currently, I am using a legacy database (20 years old) and I have a schema named CatalogItem using a table named catgeneral. Naming Lets do a quick revision of the various names used in the project to make them more standard. ago Data is used for both plural and singular meanings, so technically Data is both. The convention (I believe inherited from Rails) is that it should be the plural of your schema. ago SINGULAR Otherwise every table in your system will end with an s which is just a waste of your ring finger.
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