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This removes the redundant setup of a database/sql.Tx in each HTTP
handler.
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When nesting objects like steps into other objects like recipes it is
required to pass a *sql.Tx value to the CRUD methods of the inner
object to be able to roll back the whole transaction.
The top level object used to be responsible for the creation of this
*sql.Tx inside its CRUD methods.
This is now moved to the caller of the CRUD methods (here the HTTP
handler function). The advantage is that all CRUD methods now accept a
*sql.Tx as only argument which makes those methods more consistent.
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The model package should never modify the data. Thus the functionality
to update timestamps is moved to the controller package which is
intended to modify data.
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The model package should handle the object relational mapping (ORM).
This requires implementing the four CRUD methods:
- create
- read
- update
- delete
On create and update the model package used to modify the timestamps
like `last_changed`. This was detected by the unit tests which tested
that the data is not changed in a create / read cycle or is updated
correctly in an update / read cycle.
This raised the question if it is a good idea that the model package is
"smart" and updates timestamps. To keep the model package and the
included unit tests simple the new design enforces that the complete
data - including metadata - is always exactly the same after using any
CRUD methods.
The functionality of updating the timestamp is moved to the HTTP handler
inside the controller package. This also matches the definition of the
controller package as the part of the code which is alone responsible to
actually change the data.
This commit finally fixes the unit test suite.
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This makes the update URL more consistent with the other ones. A check
ensures consistency of the URL and JSON ID values.
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